I have the Zulip desktop app installed on Mojave 10.14.6, and I often cannot open any Zulip windows. When I right-click on the Zulip icon in the dock and select "show all windows", I just see the message "no available windows." I have tried quitting and restarting the app, selecting "unhide" from the menu, reset (cmd-R), hard-reset (shift-cmd-R), and various other menu options (such as toggling which organizations to show), with no effect. I have even restarted my laptop without being able to recover.
I was able to recover the app once by uninstalling and reinstalling, but it soon disappeared again.
Is there any way to fix this in Zulip specifically or other apps in general?