I’m not sure if it’s a problem with my system but I’ve had trouble with the Ardour splash screen obscuring the initial dialogs. I can alt-tab to the window under it but it can be very confusing. I’m running xfce4.16
Happened with both Ardour 6 and now the latest binary 7.0 download.
Ardour > Preferences > Appearance > Quirks > Show/Hide splash screen instead of setting z-axis stack order
This is enabled in Arodur 7 by default, but if you have copied preferences from version version 6, this can still be an issue on some window-managers that do not properly implement freedesktop.org spec.
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PS. you can also start Ardour7 --no-splash from a terminal