I don't think it is Mathcad either. I wonder if it is related to my video driver. It is the NVIDIA GeForce GT 635. When I try to update it with Windows 7-64 update it always fails and the NVIDIA site does not show an update. I will keep searching.
Thanks again to everyone. This site is one of the best.
I have the same issue. I just updated from m020 to m045 to see if that corrected the issue. It did not.
A work around for me is to use the calculator or the greek toolbars rather than the keyboard to get the math region started. I have not given up. I am looking into several changes that were made to my system such as new graphics card, multiple 4k monitors , windows custom font size, etc.
This was the issue with me. I have 4k monitors and so months ago I had bumped up the font size to CUSTOM DPI 170%
When I switched to 150% thankfully the problem was solved. I should have looked into it months ago, but I just used Prime 4 express instead. Good day for me.
I know it's been a long time; however, your suggested fix did the trick for me also. I did a custom font size to 120% and that worked because the built-in 125% still had the problem for me.