I visit avast forum about every twice a week.
I think Avast Team release the new build very early or lets called it not yet stable.
Its like were testing a beta release. :'(
As you can see from my signature I use XP Pro SP3 and have zero problems with this release build and unlike you I took part in the almost month long beta trial. During that month I had one or two minor issues and nothing to do with stability.
Do I think it was released too soon, absolutely not, with the 130 million plus users there are going to be massive variations in operating system, hardware, security and other software, too many to possibly test for all.
That is why there was a public beta trial to go beyond the in house alpha and pre-beta testing, before opening it up to those different permutations. This revealed problems that were resolved. The problem being for any regular release of what is essentially a big upgrade it opens it up for the multitude of different systems/permutations.
Now we are seeing that spike in the forum traffic and that was no different from when avast 5.0 was released, but they were also quickly resolved and I honestly don't see this being any different.
You can't wait forever to release after a beta trial as with the best will in the world you aren't going to be able to test for all permutations (ask Microsoft
).