I always also get this problem when sven comes to a freeze then starts playing normal again after getting this: Warning: CL_FlushEntityPacket . I also have a screen shot of what it looks like.

idk know what the error means
i just know it has to do with the internet and probably your connection
maybe a port issue or something

It's very rare to get that error no a days it was more common before steam hl came around and it usually happens to people that have bad internet connections, mostly happens to dailup users but if you have a bad piece of networking hardware it could also happen from that, some home routers don't work correctly with hl. Its never happened to me over that past few years of playing hl games and sc, not even once.

https://support.steampowered.com/kb_art ... -QJLN-1999

Thanks cartman, well the problem is probably the fact that I'm using wireless and that my brother is also connected to the internet as well.

You can try plugging directly into the router, if you can, and see if that fixes your problem.

hmm well now I get a new error saying "Your. dl [cl_dlls/client.dll] differs from the server's , can't get on any server now. should I reinstall sven coop?

look on the sc site, there was an update last night.

never even heard of that error lol.