First thing that I would check is to be sure that the base pin is fully seated.
I don't know if that would affect the loading gate, but if the base pin isn't fully seated, sometimes the transfer bar is prevented from raising properly. One symptom for that can be the inability to cock the hammer…
For starters, I'd pull the base pin and reseat it, to make sure that it "clicks" into place, indicating that it's fully seated.
If that doesn't do it, report back with a more detailed description of the problems you're having.
Folks here will likely be able to get you and your revolver squared away!