I just had the same problem as...
http://scratch.mit.edu/forums/viewtopic.php?id=39512
except I noticed that the .sb only partially/mostly downloaded even though it appeared to finish. But when I tried to open it I got the same error message, and I do have v1.4 btw.
imho...
Scratch, between this and the upload errors, methinks though server doth protest too much. Of course I could be wrong but here is my main point. Outside of Scratch, ALL my other uploads and downloads work just fine, just like they always have. Doesn't it seem strange that if the connection problem was on my end, it would only affect Scratch?
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What browser do you use?
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