"Philippe HAUTION" <philippe.haution(a)RTE-FRANCE.COM> writes:
 I recently built XEmacs 21.4.13 and I am encountering problems with
 fontify that I never met with the previous 21.4.x releases : on the
 opening of any file to fontify (.h, .c, Makefile, ...), the fontify
 progress bar blinks continuously and the syntax highlighting process
 is frozen, you have to click into the frame to make it go forward.
 However, I don't have this problem on Linux.
 
Philippe,
Please take a look at:
  
http://list-archive.xemacs.org/xemacs-beta/200305/msg00467.html
Does the proposed workaround help you?
HTH,
  Vin