Drawing partially disappears when zooming in

Drawing disappears partially when zooming in. When I zoom out everything appears again.
At first I thought it was a RAM problem on the desktop computer. But I have the same problem with the laptop.
I've attached two screenshots.
I'm using: Version: 2.1.3
Compiler: GNU GCC 4.9.1
Date created: Sep 23, 2016
Qt version: 5.4.1
Boost version: 1.60.0
System: Windows 10
Zoomout:

Zoomin:


Any ideas what's going wrong?

Horst

I think this is a bug solved in current development release 2.2.0 rc2. As you are on Windows you can get it here: https://sourceforge.net/projects/librecad/files/Windows/NightlyBuilds/master/
It is as stable as 2.1.3 and can be recommended for standard use. Give it a try.  

Works, at least on the laptop.
Thanks very much.

Horst