[support] Drupal 5.7 - cannot update nodes

[Domas]

> So now it is time to start finding that needle in the haystack.  What 
> modules that might modify the content do you have installed?  Do they 
> have proper access for the user?  What about revisions?
Ok, one more thing - it seems the problem is on the hosting provider's
side. I have another site hosted there. And it has the same problem.

Any suggestions what I should be looking for?

Domas