Thanks for the extra information. I can reproduce that behaviour in 6.3.1, it must have been fixed in recent versions. In that case, the most sensible course of action would be to update to the most recent version of Forest Pack that includes the fix (and lots more fun stuff too!).
The other issue is rather hard to diagnose, if you can send a simplified scene that reproduces the issue, I'd really appreciate it. You can send it to firstname.lastname@example.org if you'd rather not upload it publically.