pgnus-0.69 hang problem

[Jeff Murphy <jcmurphy@smurfland.cit.buffalo.edu>]

pgnus-0.69
XEmacs 20.4 "Emerald" [Lucid] (sparc-sun-solaris2.4) of Fri Feb 27 1998 on grind
	(xemacs = binary distribution from xemacs.org)
SunOS smurfland.cit.buffalo.edu 5.6 Generic_105181-11 sun4u sparc SUNW,Ultra-1

i decided to try out pgnus-0.69 (currently using gnus-5.6.45) and i've run
into a problem: 


it successfully reads my spool and delivers all of my mail to the
various folders (all are nnml folders). i can see the 

Wrote /u1/opnstaff/jcmurphy/Mail/blah/1234

messages. however, once all of the mail is sorted and placed in folders,
xemacs goes into a cpu chewing loop. truss doesnt show any system calls
taking place, and the window doesnt refresh. a control-g does successfully
break the loop, but that results in gnus not running. 

i switched back to gnus-5.6.45 and it works fine - sorts my mail and 
gives me the *Group* buffer. 

it doesnt seem related to the number of messages in the spool - i tried it
with ~300 messages and also with only about 5 and both times it went into
the loop.

is there something i can do that might produce a trace of where pgnus is
hanging up? 

thx,

jeff