Reschedule Call in 7.8.1

There appears to be an issue with reschedule option in calls when using version 7.8.1 with SuiteP theme. When you select reschedule it pops up but with grey overlay which prevents you from actually selecting anything.

Running 7.79 and reschedule does not work on Suite P or Suite 7 themes.

Having the same issue with 7.8.5.

While viewing a call, after clicking Reschedule, the Reschedule windows pops up, but the foreground is grayed out and clicking on it does not work. I am able to move to different fields using TAB on the keyboard, but mouse interaction does not work.

Same issue here with 7.9.4.

There are a few posts with the same issue, but there seems to be no solution for the bug yet.

Can anybody help with it?

Thanks

Seems to still be occurring in most recent version 7.9.6, able to tab to different fields and hit enter to save, but as soon as clicking with mouse, unable to get back on popup.