3. MP4 files that I had on the phone no longer work, a lot of my MP3 files do not install, it tells me that it is an unsupported file format.
I'm having this problem too, my mp3 files will sometimes work fine and then 10 mins later I'll get the message that the file is not supported. The only fix I've found is to reboot the phone.
Another problem I'm having is with my e-mail notification sound. Every time I turn it off it automatically resets to the standard "Droid" sound.
Smaller problem, it takes longer for my SD card to mount upon start up.