|with the September update Microsoft released the Update KB2889866, I have published here
Then Microsoft withdrawn this update. If you have installed this update, you will have some problems with synchronization.
The old product version was
now Microsoft brings a new update KB2889931 to correct this problem.
After installation the product version of Groove.exe is 15.0.4649.1003
Of course I already have installed the patch KB 2889866 and WSUS doesn’t deliver the new update. I then downloaded and installed manually the patch from the Microsoft page.