[support] So fed up with Drupal 7

[Roger]

As the subject line says, I am getting rapidly disenchanted with Drupal 
7 but there are no valid alternatives.

The problem: <Administration><Structure><Content Types><Select any 
content type> <Edit> WSOD. No error messages, no log messages, no way to 
isolate what may be the problem.
There is no way to enter the edit mode of any content type in my system. 
This started with 2 content types and now since I switched on Book 
module, is all of them. Switching off Book module has no effect.

Problem exists with the site copy on 2 different operating systems.
What puzzles me is that WSOD is only for edit selected content type, 
everything else seems ok.
I have a basic mysql database, mayo theme fully updated drupal 7 core 
and 43 additional modules.
Been having this problem to various extent for over a month.

I suspect it may again be a php memory error but  have no way of knowing.
Have ini_set() to 128M in /settings.php, have memory_limit in php.ini 
set to 128M and in this Fedora 16, at least do not get the dreaded php 
memory error mentioned in my previous emails.

Is there any way to ascertain exactly what may be causing the WSOD or is 
it simply a function of the way php works. I notice that php reads the 
config files on startup but not again unless restarted. could the 
problem be caused by memory overload through php, I'm grasping at 
straws  here.

I would appreciate some understanding on what's going on and how to 
resolve it.
Many thanks
Roger