May I suggest, for the developers to confirm your theory and assist, that you should post evidence, e.g. screenshots or videos, of the issue and any troubleshooting data. Thanks.
Please provide the developers a screenshot where the text is readable. And also a description of what exact data entry you’re attempting, again with readable screenshots of the CDU. Thanks.
Right now it looks like a recent version of the simulator introduced the issue and Laminar Research are figuring out what happened. Hopefully we’ll see a bug fix soon.