Question: Problems while trying to upload a mw file

For several hours I experience difficulties to upload a mw file (file to answer this question).

Given the error message I get

I thought it was a general technical problem.

But then I realized that this file , for instance, could be uploaded.

Nevertheless, as soon as I try to upload I get the error displayed above and it becomes impossible to upload any other file, even

Does someone has any idea about what's going on?

For the record, contains nothing special that could prevent its uploading.
This file can be uploaded here  DropBox  (replace the txt extension by mw before opening it with Maple).

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