Ask on the geda-user mailing list if there is a work around, or has been dealt with in the bleeding edge version of gEDA/gaf. Note, that you must subscribe to the geda-user e-mail list before you can post to this list.
See whether the issue is already in the bug tracking system of the component (see below). If not, file a bug report. Make sure to give all information necessary to reproduce the bug and add the version of gEDA/gaf that contains the bug.
Finally, as with all open source projects, you may flex your programming muscles and try to fix the bug yourself. Please file a patch of the changes you had to make to the BTS of geda/gaf. The patch will be gladly accepted to improve the next release of gEDA/gaf.