No unfortunately this did not fix my issue. altho there were no SM5 issues when i went and loaded a fresh open kite demo into a project, i still get the same freeze even after replacing the constants with 3vector ones. now i noticed there were two instances in the billboard where i needed to change these vectors to 3vectors so a total of 4 changes and no matter what combo i change or leave the same i still get the same issue.
just out of curiosity when you hover over the Hilltree_02 mesh where is the source comming from? all other meshes have one except hilltree_02
also could you post a full view of you nodes? maybe there is somthing else im not seeing?