Drawing View Issue

Not sure how to describe this. But for example if I start to draw with my pen, it doesn’t show in the drawing area, until I resize the window. Not sure if this is hardware or a toon boom issue (I suspect it’s hardware). Any suggestions?

Try this:

I switched from OpenGL to Direct3D and so far, I haven’t seen the problem reoccur. It was sporadic, but happened frequently. Hopefully this solution will stick. And THANK YOU for a very prompt response. I’m just starting with TBS and I’m very impressed so far. I bought it on sale “black Friday” after drooling over it for several months.