I'm a long time fm user now on windows v 10, under windows 7. Here's the issue - I created an equation in a file recycled from another project but cleared of all data, using esc m m, typed it in, and shrink wrapped it using esc mp. Then to edit it, I clicked into the equation frame and got an immediate internal error, and crashed to the desktop. No, problem, just a quirk. I restarted/reopened the file and clicked into another equation frame - same result - then repeated 3-4 times. If I click into an expanded equation frame things are fine. If I open a new doc and try this, no problem. Ideas?