Yes, protectorate income appears under "Other Revenue" in the National Summary page.

No, if one of your trade ports in New World is blockaded, that does not cause all trade from that theatre to be blocked. It's an interface problem. The Trade page makes it look like all of the goods being shipped to your home region are being blocked because the entire line shows red instead of just the units that normally would be shipped from the blockaded port and are too far from another port to be shipped out through them.

For example, if you're GB, you've got sugar coming in from the Bahamas and Jamaica, furs from Rupert's land, and let's say cotton from Georgia and Carolina. If Jamaica's trade port gets blocked, the Trade screen will show all exports from the American theatre. However, you'll still export goods to your trade partners. This is only possible because the sugar from the Bahamas, the furs from Rupert's Land, and the cotton from Georgia and Carolina are still making it to London and then on to your trade partners. Only the sugar from Jamaica is not getting through.

A different example. Let's say both Georgia and Carolina have trade ports, and that the Georgian port is being blockaded. In this case, the cotton from Georgia will be diverted to the trade port in Carolina (so long as the Carolina trade port has the capacity to export that many units. Assuming it does, you will still see all red from the American theatre in the Trade window, but in actuallity, all of your exports from that theatre are still getting through to London and then on to your trade partners.

So, like I said, it's an interface problem. The way the Trade screen shows you that one of your ports is being blockaded is not very helpful. It gives you the impression that ALL trade from that theatre is blocked, which is false, and it does not show you which goods, or how many of them, are not getting through, nor does it tell you which of your trade ports is blockaded. This is exactly the opposite on the Export side of the Trade screen. That one will tell you which trade relationship is being hindered, which makes it a lot easier for you to know which trade port is being blockaded.