sorry been away for 24 hours not logged in.
Revmob works just fine for me, so I cannot see an inherent "conflict".
However, 2 things spring to mind:
1) is this just running on simulator? Because the error you are getting is more or less the same thing I mentioned in a previous thread about sounds not working on my simulator, I thought it was something I changed (lol) but maybe it is just a Revmob + Simulator bug? Hmmm, I'll look into this.
2) Have you made the RevMobAds startSessionWithAppID the VERY FIRST line in appDidLaunch:withOptions ?