/bump
I have exactly the same problem…
hmm… we might not have the same problem after all..
It seems mod_security is blocking some traffic, I have however not found a working solution yet.
Just experienced the same problem after moving my blog from the test server to a public one. I was running IIS on the test server, while the public is running apache. Been searcing for solutions on this problem for hours now, and not a single step closer to a solution..