Yeah you're right 3ak, the BEserver.dll shouldn't be used by players. If problems persist after trying everything, I wouldn't rule out updating the server.dll, as if the code base is shared (I don't think it is but stand to be corrected) it might require them both to be update.

Good advice there, I followed this and it all worked. The path to my BattlEye folder was slightly different (as I didn't have anything BattlEye in the one above) C:\Program Files (x86)\Steam\steamapps\common\arma 2 operation arrowhead\Expansion\BattlEye I also downloaded both the client and the server DLLs, for the correct beta version: http://www.battleye.com/download.html

Not much use now but in future, keep a copy of the original .exe when you update the beta, that was if there's any problems, you can revert. Also good to keep a backup of the game folder itself, but you can always reacquire that from Steam. I've not encountered this problem but could you not also disable the mod by removing (saving them in a text file before you do) the launch options in Steam?

As 1anton12 says, you can keep hitting F5 and eventually it'll serve the file. However, how that contributes to the server loading probably doesn't bear thinking about... I haven't seen a list of "official" mirrors for the Betas?

How many guys within the DayZ team are working on this? I watched Rocket's talk at Rezz'd where he mentioned you're striving for a "dashboard" type of interface where you can view all your pertinent statistics, sounds like a big job!