Dear Maintainer, When a text object's "text angle" is set to a non-zero value the text itself disappears. The text reappears when the text angle is (re)set to 0.00. This bug was reported upstream at https://gitlab.gnome.org/GNOME/dia/issues/429. There has been no activity on the bug report. I was unable to contribute to the bug report as I do not have a suitable online gnome account and could not discover a way to create one.