Garry's Mod Brightness on Startup

Since this update that released an hour or 2 ago, whenever I launch my Garry’s Mod it is extremely bright. But once I click something it goes back to normal, is there a way to fix this brightness on startup?

Before clicking anything:

C:\Program Files (x86)\Steam\userdata\183645105\760\remote\4000\screenshots\2014-07-08_00001.jpg

After clicking something:

C:\Program Files (x86)\Steam\userdata\183645105\760\remote\4000\screenshots\2014-07-08_00002.jpg

Please help!

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