Lines not visible depending on zoom factor, grafic problems

Good Morning, Experts! I've an ugly problem: I started some weeks ago a simple drawing using colors, layers, ... - nothing very special. Today I tried to continue the work but from today some lines are only visible if I have I'm zooming out quite far. It is really the case that the lines disappear from one zoom step to the next. Going back the lines are back too. That means I can not continue the drawing because the zoom is to far out to handle the details. I'm working with Windows 10, 32 bit, quite old AMD dual core, Direct X12, Grafic: AMD Radeon HD 5700. Any ideas? Thank you very much! Thomas

I remember such trouble having to do with copied objects, but I'm not sure. First I would try the latest 2.2 RC version (Nightlies), maybe it has been fixed.

Great idea, Thank you very much! After installing 2.2 it seems to work perfect!
Hope that it remains like that.


Thomas