Emulator fails when too many files are open

[Alecat]

Just got a Thumby for Christmas and have been having lots of fun with it!

I've been making a lot of separate sprite files, and it looks like even with the "Emulator" option checked in the file, the emulator starts losing track of them. I'm not sure if there's a pattern to which files fall out of its sight first. When I click the "files" button in the emulator widget, all of my files are listed.

sample stack trace (it's just behaving the same as if the sprite file doesn't exist/doesn't have the emulator checkbox ticked)

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Games/LilBuddy/LilBuddy.py", line 118, in <module>
  File "/Games/LilBuddy/LilBuddy.py", line 28, in __init__
  File "/Games/LilBuddy/LilBuddy.py", line 115, in reset
  File "/Games/LilBuddy/Form.py", line 155, in __init__
OSError: [Errno 2] ENOENT```

I have 16 files showing in the file list, and 13 of them are .bin sprite files. Unchecking the "Emulator" checkbox for a file (that isn't called until later in the program) gets it past the error above.

My program runs fine when pushed to the Thumby :)