Yes, I fought this fight for all avast8 betas through to avast8 RC2 when it was resolved.
That said your question is too general (and doesn't say which version of MBAM, free/pro, unless + means pro), as conflict can come in many forms. My problem was with MBAM Pro enabled to start with windows boot, when I installed any avast8 beta (not matter update or clean install) on reboot after the install the XP Pro system locked up completely.
That condition, avast8 beta/rc builds on XP Pro with MBAM Pro running on boot has been resolved (for me at least).
I can't speak of any other problems/conflicts as I have none.