If you do have a label printer installed, I suggest first uninstalling that if possible, and see if the problem still occurs. Otherwise, possibly remove all printers temporarily, and see if that fixes it, then re-add them one at a time and test in between. That way you can see which is causing the problem.
It is also suggested with RMS to NEVER have a label printer set as the default printer for the computer, as it doesn't work well with RMS.