Bug? IDE display problem

[positrom2]

With B4A 5.20 I am having the problem that the screen is not updated, in especially when I drag the b4A IDE between the secondary and primary monitors. I was having this problem originally with the Intel 4000 internal graphics. Now I upgraded to a PCIe Nvidia 750 graphics card hoping that the problem would be solved - but it persists - and seems even to have got worse.
.Net was updated as suggested.
So, at present, B4A cannot be used.

Remarkably, with B4J the same problem (I had reported that earlier) was gone after the recent B4J updates.

Any suggestion?

 

[Erel]

B4J and B4A v5.20 and B4A v5.02 all use the exact same methods to display the IDE. Nothing has changed in v5.20.

The windows painting is done by .Net Framework. There seems to be a compatibility issue somewhere between your display driver and .Net Framework.

You can try to disable hardware acceleration: http://stackoverflow.com/questions/2169600/how-does-one-disable-hardware-acceleration-in-wpf (it should work with .Net 4.5 as well).

 

[positrom2]

Found out: It depends on the theme used. Choosing "OfficeBlue, Soft" the screens will update "immediately" in both B4J and B4A.
Previously, I had not changed the B4A theme (the background was white ). With white background the screen update problem exists (in B4J and B4A), with or without HWacceleration.
Took me a while. Is there any explanation?