hi Bill,
You should be good to go with the previous version.
It's always good to just check out the changelog (http://pecl.php.net/package-changelog.php?package=APC&release=3.0.11) with packages like this to see if the reasons for upgrade were critical security things... in this case it doesn't look like it - and to be honest with an accelerator it shouldn't be!
Cheers,
Myles