I have the same problem and can duplicate it on demand. It doesnt bother me much but whatever ...
FYI - I'm running Damaged right now. Only have launcher (Stock launcher that every android phone has) and Sense
1) From the home screen press and hold the "home" button until the multi-tasking menu pulls up
2) With the multi-tasking menu up, Press the home button again .... viola .... makes me select sense every time
Heres another example.
1) Open an app, lets use the browser as an example.
2) With the browser open, Press the home button
3) Now long press the home button to bring up multi-tasking
4) press the back button to exit multi-tasking
5) open the browser again
6) hit home button to exit browser ... viola .... makes me select sense every time
I have noticed some things while i was vetting information. Sometimes when you open multi-tasking (long press home button) you will see Sense listed in the list of running apps which shouldn't happen, the next time you hit your home button no matter where you are or what app your running, it will force you to pick a launcher.
Just to confirm, right now I'm on Damaged 3.2.3, only have vanilla launcher and Sense, not running a custom kernel (that i can remember). This only started happening to me really recently, like within the past couple of days so I'm actually starting to suspect it was an update to an app.
@ OP
Do you happen to have Tapatalk Pro?? Reason I ask is because i know that got an update a couple of days ago. I think a couple other apps did too but i don't remember which ones.
Edit - Tapatalk is not the issue, just removed, rebooted and duplicated. I did notice something weird, when I reboot and look at multi-tasking (without touching any apps) sense is the only running app. Sense should not be included. Got another idea to try.
Edit 2 - All fixed. Reflash your ROM. Don't wipe, just flash your ROM over the existing ROM (dirty install)
Hope this helps.