[Startrek (Martin)]

I’ve noticed during the last 2 nights imaging sessions that the sync function ( CTRL -3 ) on Stellarium Scope is playing up in Stellarium. I slew to the first star ok using CTRL -1 , Centre it with the control pad , hit CTRL-3 and it self aligns and records a sync point. Then I slew to the second star, centre it using control pad then hit CTRL-3 and nothing happens
The programme has been working flawlessly for months
I checked all settings in StellariumScope and looks ok
Any ideas ??
Maybe a reinstall ??
Any advice most appreciated