I remain (knock wood) an avast! user of four years who made the 4.8 update with no problems.
When I posted that first a few weeks ago, I mentioned an apparent new feature which noted the progress in percentage of a current scan. Watching the "counter" today, it stayed at 0% up until about 80,000 files scanned, then jumped to 96% for the rest of the trip until completion. 48 minutes total, BTW, with no viruses found!
This is not a big deal or even a complaint, but I wonder if I have some setting that is preventing using this feature to its fullest.