I habe no idea what to do:( Please help!
Does it never finish ungrouping? Try pressig the CLEAR, ON, or 2nd/Quit. If your calculator is not responding, you may have to reset it, try pulling out the batteries and such. You might want to try ungrouping and testing the .tig file on a emulator like wabbitemu and then send the ungrouped files to your calculator. The .tig file may have been corrupted or something of that nature.
I pulled out the batteries, the calculator got resettet. Another try- it worked… But the calculator froze then on loading the program menu, I suppose the calculator somehow couldn't read something of the files…
Just as a warning to TI-83+ users, the STRATEGO program from ticalc.org (Sorry, have no link) will cause your calculator to freeze!