Xt exits still occurring

On the down side, while the tab widget leakage is gone, I just got another Xt exit on a complaint of "Error: Widget *Article* has zero width and/or height", and that's with -b23 compiled *including* Jan Vroonhof's 1-line patch to lwlib-Xaw.c from last week (for XtIsSubclass), which is not yet in the sources (er, at least, it's not in the -b23 tarball I picked up this morning). This type of exit happens only when tabs are enabled; I've never seen it with tabs disabled. I've now got a gdb attached to a fresh XEmacs again, to see what the backtrace looks like, the next time it hits me again. Linux RH6.0, XFree 3.3.5, "./configure --with-mule --with-pop".