minimwatch icon not clickable in ubuntu 18.04

[leo0815]

After having migrated to ubuntu 18.04 LTS the minimwatch tray icon can't be clicked to start any action. With 'topicons plus' being installed, the program launches and connects to minimserver but there is no way to open the popup menu to do something. Even the message 'miminserver running' can't be x-ed. I've already tried to uninstall and reinstall minimwatch bot with no success.

Thanks in advance