I am having a minor issue and I would've used the bug tracker to file this as a bug but I can't seem to log into it. Anyway, The growing wall elements aren't visible if you get the game engine to Emerald Mine. Luckily there's a workaround where you can set the engine back to rocks'n'diamonds, place your growing walls, and then go back, but I think what happened is that the editor forgot that growing walls were a part of the emerald mine tools so they don't display them under the EMC tab, as they're still under the RnD tab.
Hopefully this can be fixed. Lemme know if you have any questions.
Using the forum instead of the bug tracker is perfectly fine, as the bug tracker was never really used anyway. Discussing bugs and problems is much easier here in the forum. (You could also have used the "Bug reports" forum section instead, as what you described is in fact a bug in the R'n'D level editor.)
I can confirm your bug report, and I have just fixed it for the next version! Thank you!
