Zagor,
I'm not trying to make a big issue with you. Avast! has recently been criticized for the thoroughness and speed with which it deals with viruses. Vlk has told us that more effort will go to addressing those issues.
Any of us who have ever been in a position to determine where our limited development resources will go must feel some sympathy for the avast! team. They continue to make this product available for free to a huge number of people. They are not of the size and resources (thank Heavens!) of Symantec and must, I am sure, be much more prudent in allocating their efforts.
Their principal purpose is, and must continue to be, protection of the user community from existing and new viruses. That, in itself, is a staggering task.
We see all sorts of requests, the incessant demands from a certain poster for a "prettier" interface - as if that will save anyone from a virus. Then there are the demands for faster scanning, the background drone of "avast destroyed every exe on my system", "why can't avast just quarantine a single email message?" etc.
You (and I also) have chosen to install other software to assist us in the battle against malware. I have chosen other software than you. It does not seems to cause avast! to throw up any false positives. While neither of us have chosen a second "resident" scanner both of our choices (by our choice) install software and signature files on our system. We are but two users - there are many choices out there and more appear every month. If I choose to demand of avast! that they do not cause problems with my choice and all the other users do the same - what are they to do? They could spend all their time just avoiding problems from the extra malware avoidance products that you, I and every other user chooses to install.
No, that is not the right way for avast! The right way right now for avast! is to be among the very best in combatting existing and new viruses - that will attract the mass of customers (hopefully a good proportion of them paying) that will enable the team to have resources to deploy against issues such as the one you have raised - but it must, I suggest, take second place to the prime directive.