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Go to tools > options > fonts & colors. Change the comment color to something else. comments in the .rb file don't change color; they're still a hard-to-read shade of grey against a white background no matter what I change the option to.
Problem partially solved - if you close and open the file, the color has changed.
This should be handled by the options code (triggering repaints in open files); nothing language specific here
*** This issue has been marked as a duplicate of 93969 ***