Found a couple of bugs with 17.6.2305 (one of which was critical enough to crash the OS) on a Windows 10 x64 laptop with AMD A9-9410 processor/chipset and all current Windows updates/patches.
First, I ran a scheduled full scan this evening, and when it was complete I looked for the tray icon to bring up the program window for the results. But the tray icon had disappeared. The tray program was still running, because when I right-clicked on the tray where the avast! icon had been, the avast! context menu popped up and allowed me to open the program window; it is just that the icon was not visible.
Now the bigger problem: When the main window opened, I clicked on the notification icon in the upper-right to see the scan result. After clearing the result and closing the window, I tried to open LibreOffice Writer. I immediately got a hard Windows crash and the operating system forced an automatic reboot. I didn't have memory dumps enabled, so I don't have anything to analyze to see what went wrong. I have since enable dumps, and if (or when) this happens again, I'll try to forward the info for you to have a look at.
Thanks for giving this some attention...