ZBrushCentral

Move not working and smooth brush problems

Hi

I’m very new to zbrush so it could be a stupid question.
I’m using 4R6 and it worked fine until a couple of days ago. All of a sudden whenever i try moving mesh around the canvas it resets its position and resizes it. the more i try to move it the more it automatically resizes it down. The move button works fine but it was a lot more comfortable moving it with the alt key. i thought i accidentally pressed wrong buttons and i tried reseting, tried on another mesh and same problem.
Also, the smooth brush is very slow (freezes for a second and have to repeat action), other brushes work fine.

Am i doing smthg wrong or is it a bug? should i reinstall?

thanks in advance

Most up to date version is 4R6 P2. After checking that, you may need to read some more of the documentation in your ZBrush folder.