i've been using cs5 just fine for months, and all of a sudden i can't paste frames between animation windows.
i have an asus pc, and it crashes fairly often, but never had this problem after a crash before (which it did, a few times, right before this problem happened).
i've tried reinstalling photoshop but it still doesn't work.
i can copy and paste a frame within it's OWN window, but when i copy it and try to paste in a new one the "paste' option is greyed out.
I'd rest the Photoshop cs5 preferences
To reset Preferences:
If Photoshop is already open on your screen, close it (Quit). Then hold down Shift+Ctrl+Alt (Win) / Shift+Command+Option (Mac) on your keyboard just after starting the launch of photoshop cs5.
A dialog box will pop up asking if you want to delete the existing Preferences file (the "Settings"). Click Yes in the dialog box. The existing Preferences file will be scrapped and a new one will be created.
OH MY GOD IT WORKED
thank you so much you saved my life i was literally going insane