You most likely simply have user privileges/ file permission issues on your system that prevent the updates from being sticky. Since you do not have provided any system info and other technical details, we can't help you more specifically.
Mac Book Pro 2012 running OS X 10.9.4
How come sometimes the updates work and then other times they don't?
next link says After Effects, but check YOUR permissions !!!
Thanks John. This works, but it seems I have to do it every month or so...ho hum.