Recently about 2 weeks ago or so, I got an issue where if you double click on a specific unit (say an engineer or mass extractor), it will only select that one unit and will not select any others in a group, so if I click on 1 engineer when there is 10 equivalent engineers right next to it, it will only select that 1 engineer and refuse to select the other 9. If I do a drag across the screen (the box select), then it will select all the units. This can be replicated in FAF, SCFA, and in the first Supreme Commander. I reinstalled FA, FAF, and tried different mice and it still has the same issue. No mods on FAF of any type, or on SC and SCFA. This particularly occurred after I downloaded the new custom seraphim mission in the coop missions tab, but I'm not sure if this occurred a few days after or right when I downloaded the map.
Below is a link to a youtube video demonstrating my issue. There is irrelevant background noise but I wanted to record it quickly.
https://youtu.be/IYI3SgKvBDA
Let me know what you can do.
KleanUpGuy