Ok, I've tested game on Easy, Medium and Hard and can confirm that only Easy mode has the probot scanning problem. To replicate the insufficient fuel bug just go to Astrogation, sector map and pick an out of range star, I'm not sure how you see which stars are in range to be honest, its difficult to tell on that map, but if its out of range you'll be returned to the main screen minus the graphics and be unable to do anything but quit - can take a screenshot and send if you like, but its easy to replicate.
One other thing I noticed was the initial music that plays when you are orbiting planets - its different to the tune played in the original, think its the same music that plays when you are in the sector map itself. Not sure if that's intentional or not.
Thank you for your communication so far, I really loved playing this game when I was younger, was only about 18 or so lol. Its nice to know you are keen to fix it - have all sorts of questions, like how do you stop your crew going insane - always got pretty far and then they went crazy. Let me know if you need anything else - happy to keep testing if need be :)
Steve