Has the Pathfinder behavior been removed in r58? If so, I cannot open my project which included this behavior. I guess I will download the version from the Pathfinder Behavior post...
Well apparently it hasn't, and I tried opening an old project (made in r55) with the provided pathfinder behavior with C2 and it worked.
Getting it from the topic should do the trick.
You could also redownload r58 release, desinstall and reinstall it with the newly downloaded package (maybe the file got corrupted somehow during the download).
If you experience other missing elements take this path <img src="smileys/smiley1.gif" border="0" align="middle" />