After the latest TF2 update I haven't been able to connect to a server, everytime I click a server it comes up with the error 'invalid steam key length' or 'invalid steam key size' i can't remember which. Does anyone else have this problem, or have I done something wrong? I downloaded the UnDead Patch and launched it before opening steam. I downloaded TF2 directly from Steam, though I've read somewhere else that I may need to download GCFs or something? Is this what I've done wrong, because it worked before and I didn't need to dl GCFs.