There are some missions where you need to deliver supplies to a species that look like grey and red dudes, and I had to drop off Med. supplies or Comm. Arrays, well after buying them at the starfleet, I go back and there is NO option to drop them off. You click the button and Nothing happens. So now I have 2 missions pending that aren't going anywhere because I cant drop off the supplies...HELP PLEASE!!
There is a workaround. When you have the supplies, just after entering the system, drop the mission as soon as possible. Don't approach the planet before dropping the mission. After it's gone, you can fly to the planet again, get the mission again, and deliver the supplies.