This is the most sad forum thread that I have never read (lol)
The thing is that I have the same problem (modx 1.0.2), I have started to read this thread and at every new post found it has make me the feeling of "oh! just like me!", also at every solution tried I have think "good... he has disabled all the snippets and that was not the solution, let’s see what’s the next thing"... I have read this thread like a interesting story book, thinking that in the end i will found the solution to my problem...
Then i got to the end and found that the only solution was a fresh install

, this is very sad, I can’t do a fresh install to my modx, there’s too much pages and too much things on it, a real pita work.
Thanatermesis