I'm running Vista (not 7) and have Malwarebytes 126.96.36.1990, but not spybot.
Every AVG scan shows persistent "47 rootkits" that cannot be removed, but I had them before I installed Malwarebytes. Malwarebytes doesn't find them, and doesn't seem to cause any extra trouble with AVG.
I also downloaded, installed and run Immunet 3.0 (from Clam AV), and it finds no trouble. Immunet specifically lists AVG as an application that it is compatible to run alongside.
I think AVG has an issue or two. Maybe they will find the answer in the next few days, as more and more users post to this and the 2014 Forum about these issues.
When you install Spybot S&D / Malwarebytes are they classed as active applications i.e. residential or purely for back up scanning purposes?. Your system should only have 1 active residential protection installed i.e. AVG.
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