Clearly there are a lot of issues with the 2014 version judging by the forums,
When you consider that Avast has over 200,000,000 users, the number of complaints are actually very small.
That doesn't lessen the importance of fixing the problems for those that have a problem.
It usually turns out to be an incompatibility with another program or a driver.
We all have different setups so the variations are uncountable.