What I did: Installed app a half hour ago via Mac App Store on MacBook Pro running Mojave. Mojave is set to Dark Mode and Agenda color pref is set to System. I’m just reading through the Sample Projects and haven’t created any notes of my own.
What happened: Text keeps becoming invisible in the Sample Project notes. This has happened probably 10-15 times since I installed Agenda earlier tonight. The note text still takes up space (ie the note block is still the correct size) but the text is not shown on the screen and is not selectable. This seems to intermittently happen to some, but not all notes. If I open up the Prefs panel and change the color pref from System to Dark or Light it usually causes some/all of the text to reappear, but not always. Sometimes closing Agenda and reopening makes it reappear, but not always.
What I expected: Text should always be visible.
Things that might be helpful to know (Agenda version, OS and model, etc): Agenda v2.6 on 2018 MacBook Pro w/ Mojave 10.14.1.