I'm sorry that I didn't reply yet. I had to be sure if clearing and reinstalling Avast did actually fix the problem permanently. And well, it didn't.
Please post some screenshots. What does it mean that they are gone?
After adding and enabling a filter list:
The filter list disappears after closing and restarting the SafeZone browser:
The same thing happens after adding and enabling a filter list in the Ad Block Options panel:
This problem occurred the first time a month ago, for which reason I started this thread.
The problem disappeared after clearing and reinstalling Avast but reappeared again today.
Whilst I don't know if this would resolve your issue or not.
Try rebooting as that should have the emergency updater run and the build should then be build 17.1.3394.42 .
If the reboot and or the emergency updater don't resolve it, try an avast Repair.
I tried Avast Repair, but it didn't solve the issue before.
Today I've tried again and after running SafeZone for the first time I got a pop-up, asking me if I would like to install an update of the SafeZone browser. I accepted and tried to enable my filter list again, restarted SafeZone, and again I got this pop-up. I accepted, and while SafeZone started I noticed that some text in the header was notifying about the completion of the update. After that I didn't get the pop-up anymore, even after repairing Avast once again. And my filter list keeps on disappearing.
I'm afraid that I'll have to clear and reinstall Avast again.
I hope this gives all the information you need in order to evaluate the problem. Could this be a bug? Or could my system be infected somehow?