[horde] Exception Thrown When Trying to Login ..

[John McIntyre]

Hi folks,
Coming back at you, as this problem is preventing use of horde.  Login
prevents me with a blank page, and this in the apache logs ..

[Fri Oct 11 15:19:16 2013] [error] [client xxx.xxx.xxx.xxx] PHP Fatal
error:  Exception thrown without a stack frame in Unknown on line 0,
referer: https://mydomain.com/horde/login.php

Please help!

J.M.