Same here. I also have the same problem since early July. I am not sure whether the problem is caused by Avast, however, I would like to give more observations to enhance any further investigation and analysis.
1. I try malwarebytes between mid June and early July, thus I turn off all avast (free) real-time protection. Within this period, I can add bookmarks to chrome as usual.
2. After I turn back to Avast free (with all shields on) and uninstall Malwarebytes, the bookmarks issue occurred.
3. After I bookmark a new website in chrome and check the list immediately, the new bookmarks exists and it seems I add the bookmark successfully, but once I close all chrome pages and restart chrome again/next time, the new bookmarks disappear from the list.
4. According to my own trial, disabling all shields won’t change the problem. I also run Avast full virus scan to ensure my machine is not infected
5. I haven’t tried uninstalling Avast as to my perception, if all shields (real time protection) are disabled, Avast should return to on-demand mode and it should not interact with any program itself till I start any on-demand scan.
6. For the situation ‘won’t save bookmarks, history and everything that was done before exiting the software’, similar issue occurred in my Edge browsers after I turn back to Avast free from malwarebytes.
7. I am using window 10. For Avast free version. It is now 24.6.6121. Please note what the current version is may not be a useful fact because the bookmark issue occurs before I updated to 24.6.6121
Thank you.