fziegler - Can you please take a song that demonstrates the issue, long press it on the library screen, tap Share->Export as .msf and send the .msf file to mike@zubersoft.com? Also let me know which annotation to erase before hitting undo to see the problem occur. If you can take screenshots or make a short video with your phone, that would help a lot also. I'm unable to reproduce the problem at the moment, so this will help me determine where the issue is.
Mike
Mike