Well, unfortunately the docs on what you should post when you are looking for help were deleted, lol.
As far as I can determine there have been no recent changes to the dragmath files in Moodle core. Hopefully, you have not made any changes in any files (i.e. debugging where we don't know if you have made changes will be problematic.) First place to look of course is your browser. Dump your cache (especially your java cache), close your browser, start again, open java console, open moodle, editor, and dragmath and see what pops in the console.