You are logged in some Vibe account and want to edit some documents (Word or Excel). Once you click on Edit This File link, a Word or Excel starts on your computers but then it fails to download the document from Vibe server due to invalid URL.
If any document still succeeds to open, then next time you try to retrieve this file again via the same link, the problem happens already.
This has been reported to our development.
Current workaround is to use Add-In plugin for Office, but that is available only for Windows. If you use MAC, then a desktop client is another alternative.