Thank you Mrinmay for the suggestions but I discovered the issue. It was a font that had become corrupted. I removed the font, which I have used extensively in the past, and everything now runs as it should.
Steps I took:
- I checked to see if I could load a file already containing fonts which I could.
- I then tried to edit the font in the file to see if I could change it to something else. When I could, I went down through my font list to see how many I could use.
- It stopped working on a particular font which I then proceeded to delete and now it works fine.
I hope this helps others who may be having the same or similar issues.
Thanks again for your help.