When I download some documents from projectplace, open and lock, starts to edit them in office, then press save the document save to be sure that I don't lose any work in case of crash etc. Afterwards when uploading to Projectplace, the document won't upload, and I loose all my work too.

I am editing the document in Office 2010, Word. It has not been a problem the last 6 months. Nothing changed to other documents I work with locally or for other projects - no errors or failures basically.

What really makes this odd is that when I look up the document in Windows Explorer to get it back, it shows a byte size of 0. The document is damaged and can't be opened.

This is what I have tested to see if I could isolate the problem so far.

1. No problems found yet with documents that is not downloaded from projectplace, or other documents in projectplace.

2. It has happened with one document so far from Projectplace that was sent for review. The document had been reviewed from others already. The document is a docx format.

3. First time:

3.1 Open projectplace and goes to the review section.

3.2 Open and locks the document. Word opens with the document.

3.3 Edits the document. The document has some strange formatting errors from authors side, but should not affect saving or uploading of a file to projectplace. The problem can be locally with the formatting and how Word and the integration with Projectplace handles it.

3.4 Saves the document to the computer. The dialog box asking to save just pops-up again as if the document was not saved. I press save again, same things happens over and over again. The dialog box shows that the files has been save to the selected folder locally, as I can see it in the save dialog box. I cancel further requests of saving the document after having pressed save multiple times to remove the save dialog box.

3.5 After finishing my review, I close the document. I don't get any question to whether add comments, or save back to projectplace, nor unlock it. I get one dialog box asking if I am finished with my review or something though.

3.6 I locate the document on my pc locally, and it shows 0 byte. The file has the right name and file extension. All changes is lost as it is not saved to projectplace either.

4. Second approach:

4.1 I do the same as in point 3, but this time I don't try to save the document locally, during editing, as it in the first place just seems like the save button has become a dummy. The dialog reapears just after I pressed it anyway giving me an indication of that something was wrong, and even though the document was saved to the disk it was not possible to open it and Explorer said 0 Byte on file size.

4.2 After finishing my review of the document, (no saving to local disk, etc.), I finish my review by clicking the X button in the upper right corner of Word, closing word and the document.

4.3 I get the normal process from projectplace taking me through comments, uploading and unlocking the document and everything is fine.

Any ideas to what can have caused this?
There is no issues with the PC (checked and verified), and I have only experienced it with this one document yet...