Like the title says I'm currently unable to research any of these things. I've collected about a dozen UFO propulsion's systems and captured both a harvester and a fighter and gotten the research proposal mails for all 3. However whenever I try to research any of them they appear white/grayed out and the standard mesage "we do not have all the necessary materials etc.. to research this item yet."
(And yes I have both a laboratory, workshop, and UFO hangers in the same base.)
I've even tried transferring the items to another base but to no avail. These are currently the only things available to reseach in my research tree, so researching something else before I can do these ones isn't;t possible either.
If anyone's interested in looking at my save files just send me a PM and let me know where to e-mail them.