I have a somewhat similar bug.
The first time I join try to join a server I have to download CGT assets, then at 100% that download fails. Then anytime I try to join a server I load all the way in see the map then the welcome screen and immediately get disconnected.
I did try deleting my cache, but the same thing happened over again.
I just want to mention this again, for me, this is very very similar to the pause after entering a server when using the Immersion Overhaul Mutator before the update. Video freeze only, still had sound. Before the update it only happened with IOM. Mildly annoying for maybe five seconds, but it has no affect on gameplay since its before my first spawn.
Q6600 OC to 3.2GHz
8 GB RAM
NVIDIA 680i SLI ATX MB
NVIDIA 560ti graphics card
Win 7 64 Pro
hard drives defragged weekly
Thanks - this did it for me, seems to work ok now so farTry to delete the Red Orchestra folder in your documents. It worked for me.