Hi,
We are working on the issue with Vimeo support. Perhaps the reason the issue isn't widely reported is that Vimeo isn't as popularly used as the other providers in our Cloud export. In any case, it's been broken for couple weeks now - end of last week we had to pause our investigation on it to get the 17.2 patch out. The good news, is that the fix is server-side - completely outside of Studio. Actually I suppose that has a shade of bad news, too - don't expect the 17.2 patch to fix it. But when we do fix it, it won't require another patch.
For the time being, please export with Studio to file, and use Vimeo.com to upload. Now that the patch is out we have resumed work on this and hope to have it resolved soon.