Welcome to the forum.
The open GL can only be changed when nothing is open in a session of SW.
Plus it should be unchecked as well.
If this work before, what has changed about your system?
Try restarting your machine.
The only thing that is changed, perhahps - is that i changed my DVD region code and updated the graphics driver after that, not sure if that'd have anything to do with it.
There was an answer from another topic that i'd like to try. instructions for solving the same issue for 2009 here:
"Run registry editor.
"HKEY_CURRENT_USER\Software\SolidWorks\SolidWorks 2009\User Interface\Settings
and then delete the key "WindowPos""
I looked for the WindowPos file in the same location but can not find it for my version 2010.
It might have. Does have to do with graphics.
Let us know how the registry edit goes.
I wasnt able to find the WindowPos file, I think its in a different location for 2010. there is a (Default) REG_DZ file, not sure if thats the file or not.
Can anyone who knows where this 'WindowPos' is for SDWKS 2010 please weigh in?