I am on version 3.2.1 and was having the same issue. I re-opened the file and tried to set the font (Cairo) again. It showed the triangle on Text and On Double Clicking it It prompted that
The Font is not available. Continue to Edit. It showed it for couple of other fonts as well.
Is it a bug?
can I add on Cairo font in gravit designer as font file?
or My installation is corrupted?
On Ubuntu 16.04.3, Gravit Designer
Gravit for Life!