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One of the errors I see:
Plug-in com.arm.debugger.ux was unable to load class com.arm.debugger.views.control.ControlView.
I installed 5.20 as an upgrade to 5.17 and it seems as if none of the plugins will work now. Can't open up Debugger view, etc.
In the Preferences when I try to navigate the options I get pop up window errors like
Unable to create the selected preference page.
An error occurred while automatically activating bundle com.arm.debugger.ux (370).
Checking for updates fails, but I just noticed something very odd - the About page still shows version 5.17, so somehow the upgrade did not fully happen.