I'm just starting out and taking full advantage of the 8 hour demo.

I did the "Courier for Mining Parts" mission, delivered the mining parts and brought back the blank data pad. I was rewarded with license points, credits and standing and given a message about this. There was then a message about 1x datapad being delivered successfully afterwards, not sure if this is significant.

There is no button to complete this mission, it lacks the "(completed)" bit on the mission list, and I can't start a new mission so I guess it really isn't finished...

I have left it in this state and logged off incase that is useful for anyone in seeing the problem, won't be back tonight.

If you still have the mission when you log back in, you can kill the mission in the Mission Board. Select the mission and press the "Info" button. You should be able to abort the mission there.

Ok will just do that then, was just thinking someone might like to investigate it to see if it is reproducible etc.

Just ran into that myself, Ran the parts out, they wanted a datapad to come back, but it didn't load it.
So had to abort the mission