What version of Finale, what OS?

Have you restarted the computer? Trashed the Finale preferences?

Looks like a font problem.

If Mike's advice (to restart the computer) doesn't work, have you changed the font or font size from the Finale default? Not something I would recommend.

Thanks guys.

It was finale 25, Windows 10, and I figured out what the problem is & solved it. I'll share.

The problem is that my screen had resolution of 5k, and I was on 250% dpi, and finale starting from 25 only supports up to 200% dpi - I was told this by makemusic customer service agent when I submitted my ticket about this issue.

While the agent simply recommended me that I change my dpi setting to 200%, this would make all other application so small that I can't even see or read them.

The alternate solution I found instead, was this: right click finale, properties, compatibility, high DPI setting, check "override high DPI scaling behavior", select "system" from the options (default was "application").

Now my screen is 250% dpi by default but when I open up finale it seems to think the screen is 200% dpi, making the fonts not crash.