exception from lib/vclib/svn/__init__.py

Howdy all,
 I'm new and hope this is the right place for help.  I've been through 
the back issues of "issues" without finding my answer. 
 I have the "1.0-dev" version of viewvc that gforge seems to like.  In 
it I find that I get an exception as follows:
Traceback (most recent call last):
 File "/opt/viewvc/lib/viewcvs.py", line 3483, in main
   request.run_viewcvs()
 File "/opt/viewvc/lib/viewcvs.py", line 370, in run_viewcvs
   self.view_func(self)
 File "/opt/viewvc/lib/viewcvs.py", line 1396, in view_markup
   path, rev = _orig_path(request)
 File "/opt/viewvc/lib/viewcvs.py", line 719, in _orig_path
   pathrev, rev)), rev
 File "/opt/viewvc/lib/vclib/svn/__init__.py", line 116, in get_location
   _allow_all, svnrepos.pool)
TypeError: Expected a pointer

This happens as I browse an svn repository folowing a link to a file 
listed as:
 Revision *4* 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php?root=mib&rev=4&view=rev> 
- (view 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/trunk/README?root=mib&rev=4&view=markup>) 
(download 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/*checkout*/trunk/README?root=mib&rev=4>) 
(annotate 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/trunk/README?annotate=4&root=mib>) 
- [select for diffs] 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/trunk/README?root=mib&r1=4&view=log> 

That is, clicking the "view" link.  A similar interface to "head" works 
fine:
Links to HEAD: (view 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/trunk/README?root=mib&view=markup>) 
(download 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/*checkout*/trunk/README?root=mib>) 
(annotate 
<https://osp5.lbl.gov/plugins/scmsvn/viewcvs.php/trunk/README?root=mib>)
Is this a known bug and (I may hope) already fixed?  I am quite new to 
viewvc, so I don't know enough about the code to gain much insight just 
looking at lib/vclib/svn/__init__.py.  I think it may require someone 
with a broader understanding of the code.  Any help is much appreciated.
Cheers,
Andrew