I have read mixed reports about Malwarebytes 3 (MB3). I am using the prior version MB 2 and am constantly invited to update the engine to 3. This update would mean losing the standalone website protection MB Anti-Exploit, which does not seem to conflict with Avast's (I use Avast free), although I may be wrong about that.
Meanwhile the MB icon at the bottom of the screen tells me that I have updated the virus protection by simply giving the day's date, not the update number which I think it did before. If so, it is a useless encumbrance on the machine, and I should either de-instal MB or update it 3 and do without Anti-Exploit.
If anyone is interested or has experience of this, I would be interested, since a lot of you use MB as a back-up scan.