I have found out why my screen just did partial updates on 4.0, you HAVE to have Aero themes turned on win7..
All previous versions run perfect with windows set to classic mode.. i hate this.
And my preset materials does not keep settings. I have a profile named Velleman (my printer).
If i choose PLA profile, and Set my cooling to 35% on layer 2 for example, then update/save profile. If i then
select ABS , the cooling is not set as it should. But if i GO BACK TO PLA, then now cooling is GONE..
The same happens to other settings like layerheight, filament width etc..
And NO i don't want to NEED to edit xml files or whatever.