Dimensions

Hi Everyone, I`ve recently started using LibreCAD but when I dimension a part, I get a rectangular box instead of numbers ? I`ve tried changing general scale and text height in drawing preferences. Any help would be greatly appreciated.

https://forum.librecad.org/suddenly-all-my-dimensions-have-turned-into-boxes-tp5722561p5722562.html

Many Thanks Dellus for your prompt reply and help, it is greatly appreciated.