Problem with uploading package on Unity Asset Store

Greetings!

Ever since I upgraded the Unity Asset Store Tools to version 3.3.1, I haven't been able to upload my package on the Asset Store. Whenever I submit my package, the upload progress bar is shown followed by the compression progress but at the end "Version has been changed but no new asset uploaded" is displayed.

I did select the "Content Updates" option, I'm using Unity 4.1.2 and the package I'm uploading has the size of 31MB.

Any help would be much appreciated!