I have this weird problem where apps installed on the internal memory to don't come back on after leaving mass storage mode. I have to reboot the phone to get them back. It's not to big of a problem because I don't think I will actually be transferring files that. After leaving mass storage mode I see a media scan being done, then the apps icons start saying not installed when I try to use them. They have generic icons when viewed in the app manager. All the files are accessible though.