We haven’t changed any settings and Revision Control just stopped working, neither I or my teammate are able to check-in. We aren’t able to sync or work together. When pressing check-in nothing happens, no popup, no loading screen, the program continues to run normally.
This is most likely because one (or possibly both) of you have a file in your SUBMIT FILES window that is checked out by the other user. We have seen a bug where this scenario fails to generate a proper error message. This is fixed in an upcoming release.
To continue, one of you need to Revert the file(s) the other wants to submit so that there are no locks.
Note that some project files (such as .uefnproject or .uplugin) can only be reverted in the SUBMIT FILES menu by right clicking on the file and choosing Revertfrom the context menu.