https://openxcom.org/forum/index.php/topic,3626.msg62363.html#msg62363Could be a bug, could be incorrect installation, but I thought I'd let you know.
EDIT:
Another idea: continuous research. A research mechanics that would work like this:
- You add a continuousResearch flag to a research.
- After it is researched, you can researched it
again.
- If researched again, the game removes it from researched: section and then adds it again.
- You can repeat it indefinitely.
Why?
Intelligence projects.
You have a research called, say, "track hybrid convoy", enabled by some other research related to hybrids. When researched, it spawns a mission with hybrid convoys appearing on the globe. It represents the effort of acquiring intelligence data to catch the hybrids in the act. But then you can do it again, to spawn another hybrid mission, and so on.
I'm not sure about the mechanics of research project disappearing, but I'm sure you all get the idea.
Maybe it could be considered as part of the "mutually exclusive researches" request?