Based on the way SI implements XSI’s “version platforms” (dunno how I should term them… Adv, Ess, Fou) you can setup things in the lower “platforms” but cannot utilize the results unless you’re on the “platform” that supports them.
For instance, in Foundations you should be able to set up Hair… but will not be able to see the results in a render unless you’re on an Advanced seat. This is great, because if you’re a small 3 man studio, you can buy a license of each and if you understand how all the features work, you can setup everything in Foundations while your co-worker is tweaking something in Advanced… then later when he/she is not using the Advanced seat, you can open up that seat and tweak the groundwork that you layed in Foundations. This is a major time/money saver, for the production savy studio (small, medium or large).
i think that’s what your seeing in the FXTree. You can lay the ground work, but can’t look at the results because you don’t have on the right decoder ring.