If you have a problem with TPTQ Arabic fonts, try restarting your computer first. We do test our fonts rigorously, so chances are that there is a problem with font installation. If you are using a font manager and the font still doesnʼt work, try installing directly to the system instead.
If the font still doesnʼt work, please do get in touch. Please donʼt forget to mention exactly which fonts you use, how you installed them, which platform you use them on, and which applications they donʼt work in. Providing screenshots from your computer is very helpful.