Yes. Temporary fix (NOT a permanent fix) is to disable Avast Web Shield. It's broken.
And I don't have Malware Bytes Anti Malware in my computer so I don't find that excuse plausible. Neither does our son have MBAM. Ex though, has MBAM. But the same there, disabling webshield on her computer and no more loops.
AFAIK, Avast said a solution would come this week, but as always, things are not that easily solved. So I stick to the generic recomendation given from Avast Team (that took me almost a day to figure out by myself), disable web shield for now if you experience problems.
This is like a Moment 22. You don't know what's wrong unless you can reach the net, which you can't, so you can't get a solution. But Please read on the web forum :-P ...