I see that I have to overwrite the dialog.js-file when installing dragmath. I was about to do that when I noticed this siting from the dragmath-site: "There has been discussion that a line in dialog.js has produced some problems in Moodle version 1.9.5+ (the editor disappears) and that by deleting the line that adds the dragmath icon the problem is resolved. This may be an artifact of the impact of the icon sizing, so if you discover such a situation please post at once to the Math Tools forum on Moodle.org so that the situation can be fully documented and resolved." Anyone know what to do? Should I just overwrite, or what?