[horde] logging into horde just fails quietly

[Robert P. J. Day]

   i am fresh out of ideas here, and i apologize for abusing this list  
as much as i have.

   with my new 3.3.4 install, i have an account and password that  
seems to be valid.  when i use it to login to horde, the log file  
(/tmp/horde334.log) shows:

Aug 26 14:58:02 HORDE [notice] [horde] Login success for rpjday  
[192.168.169.1] to Horde [pid 16754 on line 138 of  
"/var/www/XXXXXX/horde/login.php"]

   should i then assume that the authentication worked?  except that,  
rather than getting dumped into a horde session, the name and password  
test fields are cleared and i stay at the horde login screen.  no  
errors, no diagnostics i can see.  just quietly resetting everything  
and waiting for the next login.  as if, somehow, there's a bad  
redirect or URL or something.

   given that my log file doesn't show any errors, what other log file  
can i check to see what's happening?  my biggest frustration right now  
is that i don't see any error messages being printed *anywhere*.  if i  
could at least see an error message, i'd have something to go on.

rday

p.s.  after i had earlier unloaded the 3.3.4 tarball and set up  
initial config/*.php files, i could at least get into horde and start  
the configuration.  now i can't get there at all.  help?