Suddenly (windows update?) it is no more possible to adjust the pagesize of an image. Paint hangs then, i have to kill it with the task manager.

Hi!
I am German.
I use Corel Photopaint/draw X6 64 Bit on a HP Workstation (2Xenon 20GB) with win 10 ultimate. Also a X3 was installed.
 It worked great for some month on windows 10.
Suddenly (windows update?) it is no more possible to adjust the pagesize of an image. Paint hangs then, i have to kill it with the task manager.
X6 hangs and also X3 hangs.
I did uninstall X3 and X6 and did install X6 new, added all uppdates.  
The effect is the same. Also setting of the compatibility options to win 7 did not change the behaviour.
What can i do ?