BUG REPORT: Font menu font selection

If I start up xemacs, the font used is Lucidatypewriter 14. The Options Menu the agrees with this, as indicated by the green diamonds. The font was set using the following X resource: Emacs.default.attributeFont: -*-Lucidatypewriter-Medium-R-*-*-*-120-*-*-*-*-*-* If I then change the font SIZE from 14 to 18 using Options->Size->18, the font size does indeed change, but the typeface changes from Lucidatypewriter to Courier. I have to use Options->Font->Lucidatypewriter to get back to my preferred typeface. This seems like a clear user interface bug. Although `custom' is involved here, this is not obvious to the untrained observer. Martin