selecting pencil lines

Hello- I am new to Harmony 11 and I have been learning how to clean up frame by frame animation. I seem to be having a problem that after I draw my frame of clean up, sometimes I cannot go back into that frame or previous frames and edit the pencil lines. I cannot select them at all with the selection tool. Its like they are locked but I have check my layer to make sure it is not locked, that I’m on the correct layer and that I’m not on a different OL, UL, Drawing layer or Color layer that is main stage tools on the right hand side. I’m totally new at this, so it could be something silly that I just don’t know about. PLEASE HELP! Thank you!

Sounds like you already have a good approach to solving this but if you’re stuck, contact support to have a look on your system the next time it happens.