Captivate 2019 - can't get rid of ligatures on 's' and 't'
I am having a problem with ligatures randomly appearing on lower case 's' and 't's hooking them together in Captivate 2019 (see below).

It can happen in completely new or existing cptx and cptl files, but there's no obvious consistency in when it will happen.
The only other Adobe product on my machine is Captivate 8 which also has the same problem. When I began encountering the problem in Captivate 8 the only thing I could do was open a new file and copy the course over. But in Captivate 2019 it can also happen when I open a completely new file so I can’t do that anymore.
- The font I use is Arial (although I have also found it happens with Tahoma and Trebuchet).
- My language setting is to English and I don't have any other languages set up as a preference on my machine.
- I recently got a new laptop and redownloaded everything.
- My laptop set up is exactly the same as other members of my team, but I am the only one who appears to have the issue.
Any ideas on where else to look to get rid of them would be really appreciated.
