Unable to research

Hello Commander,

I assume you are using Firefox? There is an known issue with that Browser since its last update 59.0
We have a fix prepared that will be deployed to a few worlds today and the rest of the Game around early next week.

In the meantime, all we can do is recommending using a different browser until your world has been patched.

https://forums.ea.com/en/commandandconquer/discussion/217503/server-maintenance-march-22#latest