So I did fresh install of Avast Premier to test out stuff (without restarting after install finished). Windows 8.1 X64, Asus laptop.
When I ran SDS scan, it finished but the strings were overlapping each other. When I moved to Protection menu and back, I got the red (UIfailed) message.
Language installed: Estonian
EDIT: Second scan did not bring this glitch.
Don’t know if it would have made a difference but, it’s never a good idea to test anything
or even use a new install without first doing a reboot. We have already seen that on some
occasions, more than a single reboot is required before everything works properly.
Agree. However, Avast did not request restart so being “normal” user, I did the “correct” thing 
Maybe.
But it didn’t work, say.
All Bob is saying, don’t wait for avast to tell you to reboot and maybe you can avoid this issue.
Lord_Ami is also correct in the fact that Avast should have requested a reboot.
The average user only does what he/she are asked and many times, not even that. 
For version [2303]: See below.
Are the files actually protected? As every run of SDS should produce no new files when scanned if none were added between scans.