cTrader Desktop issues today!!

Hi! Have a problem today where the application is being super buggy.. On some charts (but not all) drawing tools are behaving badly, ie dragging a trendline, it suddenly stops when being extended, or moved. Using “DEL” on the keyboard on highlighted drawings is not deleting the object. As I say, on a couple of charts it's working fine but on most, not.

I've restarted my PC a few times, have also deleted the offending charts and created new ones, but still, the same is happening. 

Any ideas? Anyone else suffering this today?