I happens fairly consistently (and has for some time).
It is not dependent upon a particular note. It happens in different projects, categories and on different computers (although not on iOS that I can recall). It happens on my iMac and Macbook. It has happened for months, so the problem does not seem to be related
to the Agenda version or the MAC os versition
I do not usually run (or open) Agenda in full screen mode, because I primarily use it to take on-line class notes, or to refer back to my notes when writing, so I almost always have a browser or word processor open at the same time.
I have attached a screen shot of what it looks like. When it opens like this, the only think that works is to quit Agenda and restart with a larger window (although Agenda always takes up at least 1/2 of the monitor, so I am not trying to open it in tiny windows.
This does not always work however. Sometimes I have to select a different project that only contains a blank note, quit the program and then open it.
Again, it is not confined to any particular project or category. If I had to guess, I would say it is related to the size of the window, but I can’t be positive.