I had something similar this year. On 02/17/2020 ProSeries Customer Support (actually got through to a knowledgeable person) sent me a Font Check and a series of Fonts that got screwed up in a Windows Update. There was just a recent update by Microsoft so you may have had that issue crop up. My suggestion is to keep trying technical support and see if downloading and installing their specific font list fixes the problem. It did for me.