HammerEditor - Buggy Viewports...
Posted May 15, 2011
I've had this issue in the past and it once just fixed itself magically.
However the Portal 2 Hammer editor bugs out with the viewports. Just randomly bugs out after I do a compile and test a map, forcing me to restart hammer... or even just loading one of the example maps valve kindly donated.... ideas?
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Posted May 15, 2011
Replied
1 minutes
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Posted May 15, 2011
Replied
5 minutes
later
Ah... >.<
I looked at that thread and didn't see anything before. Looking now I see the comments 
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Posted May 15, 2011
Replied
8 hours
later
Run your game in Windowed Borderless mode, and that should fix the problem when you switch between Portal 2 and Hammer.