Too much flicker in the gutter

In my last build (freshly updated from CVS minutes ago) the gutter flickers much more than it used before. It seems to be redrawn each time the cursor moves and each time a paren blinks. Looks like christmas lights but a bit more unpleasant ! Oscar uname -a: Linux lsppc4.epfl.ch 2.2.5-22smp #1 SMP Wed Jun 2 09:11:51 EDT 1999 i686 unknown ./configure '--cflags=-g' '--site-prefixes=/usr/local' '--with-mule=yes' '--with-menubars=lucid' '--with-scrollbars=lucid' '--with-dialogs=athena3d' '--with-png=yes' '--debug' '-error-checking=all' '--use-union-type' XEmacs 21.2-b23 "Hebe" configured for `i686-pc-linux'. Where should the build process find the source code? /home/figueire/xemacs/src/xemacs-21.2 What installation prefix should install use? /usr/local What operating system and machine description files should XEmacs use? `s/linux.h' and `m/intel386.h' What compiler should XEmacs be built with? gcc -g Should XEmacs use the GNU version of malloc? yes (Using Doug Lea's new malloc from the GNU C Library.) Should XEmacs use the relocating allocator for buffers? yes What window system should XEmacs use? x11 Where do we find X Windows header files? /usr/X11R6/include Where do we find X Windows libraries? /usr/X11R6/lib Additional prefixes: /usr/local Compiling in support for XAUTH. Compiling in support for XPM images. Compiling in support for PNG image handling. Compiling in support for (builtin) GIF image handling. Compiling in support for JPEG image handling. Compiling in support for TIFF image handling. Compiling in support for X-Face message headers. Compiling in native sound support. Compiling in support for Enlightened Sound Daemon (ESD). Compiling in support for Berkeley DB. Compiling in support for LDAP. Compiling in support for ncurses. Compiling in support for GPM (General Purpose Mouse). Compiling in Mule (multi-lingual) support. Compiling in XIM (X11R5+ I18N input method) support. Using raw Xlib to provide XIM support. Compiling in support for proper WM_COMMAND handling. Using Lucid menubars. Using Lucid scrollbars. Using Athena-3d native widgets. Using Athena-3d dialog boxes. Compiling in dynamic shared object module support. movemail will use "dot-locking" for locking mail spool files. Using the union type for Lisp_Objects. Compiling in extra code for debugging. WARNING: --------------------------------------------------------- WARNING: Compiling in support for runtime error checking. WARNING: XEmacs will run noticeably more slowly as a result. WARNING: Error checking is on by default for XEmacs beta releases. WARNING: ---------------------------------------------------------