This is really weird. I've been working on this random project for over 3hr. straight w/o saving when suddenly: boom, scratch goes invisible. It's not closed or having responsive issues, simply invisible. I tried to use my memory to determine where all the buttons were, and sure enough, when I tried to save, it saved exactly where I wanted it to. But I can't close it and it's taking up over 50K of my memory right now.

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That's wierd... I am sorry to say this but try reinstalling scratch
Or, if you wanted you could check on your hard drive (but it's rare that it is saved there..)
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Ehm, restart?
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