Clarify what's the problem with KDE's klipper applet.

etc/PROBLEMS

@@ -1074,14 +1074,15 @@ EOF
 
 * Emacs hangs on KDE when a large portion of text is killed.
 
-This happens because KDE intercepts the X clipboard and appears not to
-notify Emacs properly when it is done.  A C-g will not interrupt this:
-Emacs will print "Quit", but will continue waiting.  After a while,
-Emacs will print a message:
+This is caused by a bug in the KDE applet `klipper' which periodically
+requests the X clipboard contents from applications.  Early versions
+of klipper don't implement the ICCM protocol for large selections,
+which leads to Emacs being flooded with selection requests.  After a
+while, Emacs will print a message:
 
   Timed out waiting for property-notify event
 
-A workaround is to kill the KDE application called `klipper'.
+A workaround is to not use `klipper'.
 
 * Emacs compiled with DJGPP for MS-DOS/MS-Windows cannot access files
 in the directory with the special name `dev' under the root of any