Quote - I'm having trouble with these plants: all the Alder trees, the Tomato plant, the Betel Palm Seedling, the Aucuba plant and several others.

They were all part of Infinite 7.5 and aren't part of Complete 9 by default. But since I paid for them (Infinite wasn't cheap!) I don't see why I shouldn't be allowed to use them in Complete too.

From your description, it seems that e-on define those plants belong to infinite version only. In your case, you must upgrade to infinte again to use those plants. Vue 9 complete is complete version only.

How about installing both version on same pc? You created files with those plants in 7.5 infinte, then re-opened and rendered them in 9 complete?