repo browser stops responding accessing repo with externals [1.7.2]

Do to our organisation of a shared code base, we have a number of repos.
with ~20 externals in their trunk. Since updating to 1.7.x we've been
having hangs and crashes in the repo browser when accessing these repos
(Windows XP client, Solaris server, repeated with Linux server).

   Going back to 1.6 seems to solve any issues, and I think its because TSVN
1.7 is now probing externals in the repo browser.

   What we see is the initial tree come up after a few seconds, and then the
repo browser freezes (we get a Not Responding in the title bar) for over
half a minute. Often, the repobrowser crashes, or comes up with a dialogue
about having problems connecting to the server (and offering to work
offline; although it says there's been a problem, there's never a mention
of that that is).

   We use https, so the wireshark logs aren't particularly useful (I just
see a stream of SSL traffic).

   Oddly (or not!), I did a test by porting one of the repos to a test Linux
server (1.7.1, the normal one is a Solaris server running 1.6.12 IIRC).
This [mis]behaves much the same way.

   However, on the test box, I can use unencrypted http. When I view the
wireshark dump of an http access to *this* server, I see a burst of
activity, up to the freeze, and then *nothing*, for about forty seconds.
All active requests have cleanly closed at the point it freeze (all FINs
ACKed, etc.).

   Then, there are more requests from the client (after the 40 s.), with the
initial ones apparently failing to log in (see auth. reqs. come back from
the server). Then it all settles down with some successful connections, and
finally all seems to be working (at least, in those runs that don't crash!).

   Any suggestions? Debug output I can enable? I have VS2005; I could
potentially build the repobrowser from source to help diagnose things if
it's not too tricky to build (I got the source once, for reasons I forget,
but never needed to try to build it).

-- 
[neil_at_fnx ~]# rm -f .signature
[neil_at_fnx ~]# ls -l .signature
ls: .signature: No such file or directory
[neil_at_fnx ~]# exit
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