I'm using QVS 9.0 SR2 and have problems getting AJAX client to fire of OnOpen() Document Event trigger. The action I'm trying to use is to "Apply bookmark" at document opening time. It works in IE Plugin and the win32 dev client.
I suspected that the problem is related to that we use "Initial Data Reduction Based on Section Access" / "Strict Exclusion" but the problem is still the same after disabling them?!
You may want to try upgrading. I had a similar problem with the earlier verstion 9 SR patches. I'm on SR5 now and my OnOpen trigger, which just runs a macro to make some initial selections, is firing properly.