PROBLEM Add page broken in 3.3.5?

[shawn_a]

I think you have permissions errors or owner problems, if you say some pages work and some do not, then there must be a permissions or owner difference between the two.

Either permissions are insufficient, or owner is not in group or safe mode is on.
I doubt this is an issue with 3.3.5

Problem is you say fancy urls off works, which is rather odd, and contradicts the "some work some dont behavior"