Well, that one was short-lived ;-)
The third release candidate (released only yesterday) introduced two annoying bugs regarding several upload plugins (OAuth authentication process was broken) and the external command plugin (not working).
Those are fixed now, and the fourth release candidate is now available on our version history.
Here are the release notes:
1.0.4 build 2176 Release Candidate 4
* Fixed error during OAuth process due to authorization dialog not opening, see bug #3578480
* Fixed error in external command plugin, see bugs #3578391, #3578379, #3578377
* Fixed editor window not being resized to image size, see bug #3578325