@tparavani yes! that worked! thank you!

I have the same problem. Open Opera, pin it to the task bar, closes it, open from the pinned icon, this icon disappears and I have to pin again. I tried to re-install it twice, tried to change the installation folder and to "install for all users", but nothing worked. Hope to find a fix soon cause its very annoying. Windows 10 v1903 here.