I've just upgraded to 1.8.1. I opened an existing afpub file, which suggests preflight issues (red bell).  If I try and export then the "Preflight warnings" dialog is displayed. If I click on "Open Preflight" nothing happens; i.e. I don't see the Preflight panel. If I double-click the red bell I don't see the Preflight panel. Am I missing something? I'm on Mojave 10.14.6.