SOLVED
UPDATED TO REFLECT CHANGES NOTICED IN 6.2.B.1.96
This is an Bugs Review / Update / and comparison from what I could find in my experience with the Xperia Acro S on Ice Cream Sandwich and Jelly Bean.
For the record I recently updated mine from version 6.1.A.2.45 (4.0.4) to 6.2.B.0.200 (4.1.2)
But I keep my wife's Acro S on 6.1.A.2.55 to better contrast the difference and bugs... NOW WE ARE BOTH AT 6.2.B.1.96
Also, notice that changes made are at the end of each bullet point in color... Green meaning is fixed, orange somewhat not Sony's fault, does not apply as bug or a workaround is available, and red is trouble.
So this comparison will be focused on those Bugs, and I will also comment on the new features and the ones that were left out.
1) Camera / Album / Gallery
1.1) Error message of "Internal Memory Error".
SEEMS TO BE FIXED ON JB. BUT I HAVE YET TO TAKE LOTS OF PICTURES TO REPRODUCE ERROR AGAIN.
1.2) 3D Multi-angle pictures are saved twice.
THIS FEATURE SEEM TO BE REMOVE FOR THE JELLY BEAN UPDATE.
1.3) If I open a picture straight from the view finder, many times when I zoom in, it shows black squares as if there were patches missing from it.
THIS SEEMS TO BE FIXED
1.4) Sometimes when sliding to the next picture in Album or Zooming by double tap, the picture jumps outside of the screen area.
THIS WAS FIXED. NOW THE ALBUM IS SMOOTH AND RESPOND BETTER
1.5) Selecting a sharing option from Album should remember the application used to share. But every time I have to reopen the full list to find the app of my choice... (other phones keep the selection next to the 3-connected-dots sharing button) This phone resets that selection.
THIS WAS FIXED. THE MOST USED APP FOR SHARE GOES AT THE TOP.
1.6) While Quick Launch is an awesome feature, it does not work if I halfpress the shutter and then press completely... I have to press all the way quickly...
THIS WAS FIXED
2) Music
2.1) It is not common, but sometimes the music skips maybe due to load by other applications running.
HAS NOT HAPPENED AGAIN ON JB. GOOGLE CHROME TAKES HUGE CHUNKS OF RAM AND FORCE CLOSES OTHER APPS INCLUDING WALKMAN
2.2) Sometimes music does not resume once again after it was pause by apps such as received call, opening the camera.
THIS IS APP DEPENDENT AND IT ACTS BETTER. NOW WE CAN KEEP THE MUSIC PLAYING WHILE TAKING PICTURES EVEN IF THE SHUTTER SOUND IS ON.
2.3) Music interrupts when receiving a SMS, GTalk and while receiving instructions from Waze. But it works fine without interruption when receiving a Whatsapp message. This might be an Android problem unrelated to Sony's software.
THIS MIGHT BE AN ANDROID ISSUE.
3) Miscellaneous
3.1) Currently the Power Saver app resets its configuration after a phone reboot, so this makes it utterly unusable. This problem is found on other Xperia models.
THIS WAS REPLACED BY EXTENDED MODE. ASSUMED FIXED
3.2) Sometimes the Infinity view of contacts does not display all icons, specially when viewing a contact shortcut in Homescreen.
THIS WAS FIXED AND THE DESIGN IS DIFFERENT
3.3) This model is not able to display battery percentage natively, but the Xperia Advance can... And it is a native feature of ICS
FIXED
3.4) Lock Screen Wallpaper does not show, it only shows the same wallpaper chose on homescreen. No matter if I try to change it.
THIS IS STILL PRESENT. IF YOU HAVE SECURITY FOR YOUR PHONE SUCH AS FACE UNLOCK OR PATTERN LOCK IT WILL NOT DISPLAY A LOCK WALLPAPER NOR WILL HAVE THE MUSIC CONTROLS UNLESS MUSIC IS PLAYING.
3.5) By using a standard BT keyboard, there is a lack of key combinations, and when using arrows to select "Settings" from the notification bar, it is not able to do so. The only way to select "Settings" with a keyboard is from the App Drawer
NOW KEYBOARDS ARE NATIVELY SUPPORTED BUT THERE IS NO SUPPORT FOR WINDOWS KEY, F1-12, PRINT SCREEN... SO YOU BETTER GET AN ANDROID KEYBOARD INSTEAD. NOTIFICATION BAR IS SELECTABLE BY KEYBOARD, BUT RECENT APPS IS NOT.
3.6) Sometimes when getting a call, the slider is not responsive. The solution is to hit Power button off and on. This might be an Android problem.
THIS HAS NOT HAPPENED YET
3.7) There have been a couple of times when the Accelerometer is not responsive. And accessing to the Service Menu, it shows no values for X, Y and Z. Solution is to reboot phone.
POSSIBLE HARDWARE PROBLEM OF MY UNIT
3.8) Even though there is values changing in Service test for Ambient light sensor, I see LITTLE change when using the phone.
AMBIENT LIGHT SENSOR WORKS BUT IT DOES NOT CHANGE DRAMATICALLY SO IS DIFFICULT TO PERCEIVE...
3.9) Even though description and MENU shows WiFi Direct as a feature, there is no way to activate it. But the Xperia Go has it in connection settings... So we are stuck with slow transfers via Bluetooth...
NO WIFI DIRECT STILL... VERY DISAPPOINTING
3.10) Most Mouse I have tried have only left click functionality and scroll... and the right and middle click, makes the same left click. Logically it should allow for a "menu" click, and/or a "back" click...
STILL PRESENT... ALL BUTTONS ON THE MOUSE DO THE SAME LEFT CLICK FUNCTION
3.11) Now this is a minor complain, and probably hardware related... but touches near the edge of the screen are registered to the extreme edge... almost like forcing the touch to the edge... making difficult to select taps slightly separated from the edge.
THIS IS PRESENT. PROBABLY HARDWARE RELATED.
NOW THIS ARE IMPORTANT NEW FEATURES FOUND (SONY RELATED). AND ALSO LEFT OUT FROM PREVIOUS VERSION. AND FINALLY NEW BUGS
NEW
- Ability to add, delete and set Homescreen Pages (up to 7)
- BT, WiFi, Sound and Data toggles on Notification Bar
- Camera was revamp, with front and back toggle, Video Rec button, and pictures (1 MP) while recording video.
- Walkman app has better shuffle and repeat buttons. Notification Bar buttons (pause and next track while compact, and all buttons if expanded)
- Movies now show a small clip of where you left off so you can resume faster. (But still no subtitle support)
- Small apps are present with the Recent App list.
- App drawer now is better to customize, uninstall and share apps...
- Now my Sony BT Car Stereo reads more info from the music playing.
NOT ANYMORE
- There is no 3D pictures anymore. 3D Pano or Multi-Angle.
- There is no fast scrolling using 2 fingers... This was particularly useful for list that did not have the scroll button on the side.
- No overview of widgets... Ok to leave out.
- Recent Apps shortcut is now achieved by double tapping Home Button instead of long tap...
NEW BUGS
- Recording video in Full HD lags a lot.. and 720p also lags but less. FIXED IN .96 UPDATE
- I am experiencing bluetooth reconnection problems with my Logitech keyboard. when I turn it off and on, it will try to reconnect but instantly drop the connection... I have to turn bluetooth Off on the phone.. and back On again. It Fixed itself... maybe a couple of reboot. It did not fixed itself... it is still present... IT FAIL TO RE CONNECT to my Logitech K810 Keyboard. Used to work wonderfully. STILL HAPPENS BUT LESS OFTEN IN .96 UPDATE
- Volume Up becomes unresponsive after plugging headphones or even making a bluetooth connection. THIS WAS FIXED IN .96 UPDATE
- A NEW BUG APPEARED MOSTLY WHEN USING HDMI. SOUND STOP FROM TV AND GOES THROUGH THE PHONE DIRECTLY. A WORKAROUND IS TO UNPLUG WHILE SOUND IS STILL PLAYING AND PLUG BACK IN
I hope this can be useful to Sony and other Xperia Acro S users...
Thanks
Diego.
i hope it goes well for me 
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