21.4 hang during custom menu activation

When I attempt to traverse through the customize menu hierarchy, my xemacs process hangs completely. This seems to be triggered by certain menu entries, like "Programming" (see the attached snapshot). I have no idea if this is win32-specific or not. I haven't had a chance to run it under a debugger yet to see if I can figure out where it's hanging. Does anyone else see this, or better yet know how to fix it? -Jim Potts describe-installation: OS: Windows_NT XEmacs 21.4 \"Copyleft\" configured for `i586-pc-win32'. Building XEmacs in \"G:\\src\\xemacs\\nt\". Using compiler \"cl -nologo -W3 -O2 -G5 -MD\". Installing XEmacs in \"c:\\Program Files\\XEmacs\\XEmacs-21.4\". Package path is \"~\\.xemacs;;c:\\Program Files\\XEmacs\\site-packages;c:\\Program Files\\XEmacs\\xemacs-packages\". Compiling in support for Microsoft Windows native GUI. Compiling in support for XPM images. Compiling in support for GIF images. Compiling in support for PNG images. Compiling in support for JPEG images. Compiling in support for toolbars. Compiling in support for dialogs. Compiling in support for widgets. Compiling in support for native sounds. Compiling in fast dired implementation. Using portable dumper. Using system malloc. Using DLL version of C runtime library