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I just started using hammer, it's fun, though a bit confusing. However when I run HL2 in the background (so i can switch to the map i just mad) it will run once. But if I make a change to the map, and then reload HL2, I get a "Failed to Lock vertex Buffer" error as well as a memory error following it, and then HL2 crashes. Anyone else getting this? I could just quit out of HL2 after every time, but it takes time.