Hi, I keep replying to myself :) I spotted a small mishap in the patch, which I corrected. From the same url the real correct patch. I've also uploaded a small .blend to show it actually works :) www.letwory.net/downloads/ipotest.blend > >> http://www.letwory.net/downloads/ipo_bf.patch >> >> This patch fixes bugreports >> >> #1435 >> and >> #1157 /Nathan