I just noticed that Update 08 for RSRBR2010 has been released. Not sure how much is affected but the supporting notes say that there are changes to Mylnky Stage.
I'd strongly advise all drivers to download and install this Update before running Round 4.
Attention for anyone who has done Update 08, cose I did, to check that Mlynky stage afterwards beacause first time that I've tryed to run it I was kicked out. I restarted RSRBR and now it seems to work, so everybody check it before the round starts!