Ok, so I'm not new to ES2 modding but I'm tearing out my hair here.

I'm trying to mod planet specilizations. But they refuse to show up in the tech tree and they can't be built.

Looking at the log file, everything appears to be loading properly, and looking at the mod tool shows that gaining the relevant tech adds the proper prereq.

So in desperation I copied in the relevant parts of another working mod of mine that also adds planet specilizations, and now they don't work either. Hmmm.

Then I copied the non-working specilizations into the working mod, and presto, they now work!

At this point, I figure something isn't loading properly, but what? The log file isn't throwing errors. The tech tag is appearing in the mod tool. So it must be the simulation descriptor, I guess. But I've looked it over and over and it looks good, and so does the loading. And since it works with the copy/paste those files must be good too.

I've examined the relevant parts of the working mod, and I don't seen any differences yet.

WTF?

Is something different in the Plugins? 

Without examples it's hard to tell what is happening.