I just completed the quest for the magical herbs, and set sail back to belgrum. Got there, visited the blacksmith, stocked up then headed east. When I hit the edge of the screen to go east, a message popped up saying I need to register if I want to go any further. AGHH. I registered a long time ago. I have the FULL version, and HAVE registered. Lucky for me, I save my progress frequently. I exited and closed the program, rebooted, and had no further problems.
I could not reproduce this problem. OH well. must be one of those one-time gremlins.

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This is known, it also happens on the first screen on reef island, If it happens again, you can save right there, reload that spot, and it will be fine.

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neee-wom!