-> https://support.avast.com/article/Troubleshoot-Antivirus-UI-Failed-load
That's not a true fix though. They need to actually fix this issue that doesn't require steps like this.
I haven't read much through the forum , although I admit I should.
My conclusion: I have never had this problem in the past, then again I've always had root privileges . *Windows 10*
I hope this helps formulate a fix. Windows 10 just had an April 2018 changing loads of features, privileges, and adding them. \
This just like many windows updates and service packs in the past has nearly dug my desktop into a 6 foot hole,
Untill a system restore, recovery, or format has been done. After the "April 2018" Update , everything has gone to shit.
Including avast being denied all privileges and all of its launch arguments. My Display driver, graphics adapter, even the popular game "Fortnite" wont launch anymore unless its ran as administrator. As far as avast goes im just now getting the time to dedicate administrative privileges back to it. I believe this issue is due to the windows 10 update, unless others have experienced it prior.