Hi. It's been a while, but, there is a way to fix that, if i can remember it exactly. it's pretty simple, actually.....hmmmmm....thinking.....mokay, I think this was it:

There are 2 Autopilot keys. One is for Autopilot, one is for Toggle Level Autopilot. You will need to assign a key to the Level AP ( I use Ctrl+A ). When you switch to external view after putting autopilot on, hit the Level Autopilot key you assigned....you should see a message, can't recall what it is. After this, when you return to cockpit view, Autopilot should still be active, and should function in both views. Note: You should only need to do this one time....after that, unless you turn Level Autopilot on again, it should 'stick'.

I hope that's the procedure sequence....but, the Toggle Level Autopilot is the key thing there. Default, I think, is to have it 'on'....this causes the issue you describe. Hope that helps.