[Plugin: W3 Total Cache] APC Not Selectable

Hi,

I recently switched to W3 Cache and got it working nicely. I then decided to try out APC caching but noticed that it was not available. I then asked my hoster to install APC which they did but the option is still not selectable.

I verified that APC is installed by running the last command mention in the installation instructions # php -r ‘phpinfo();’ | grep ‘apc’

apc
apc.cache_by_default => On => On
apc.enable_cli => Off => Off
apc.enabled => On => On
apc.file_update_protection => 2 => 2
apc.filters => no value => no value
apc.gc_ttl => 3600 => 3600
apc.include_once_override => Off => Off
apc.localcache => Off => Off
apc.localcache.size => 512 => 512
apc.max_file_size => 1M => 1M
apc.mmap_file_mask => no value => no value
apc.num_files_hint => 1000 => 1000
apc.report_autofilter => Off => Off
apc.rfc1867 => Off => Off
apc.shm_segments => 1 => 1
apc.shm_size => 30 => 30
apc.slam_defense => 0 => 0
apc.stat => On => On
apc.stat_ctime => Off => Off
apc.ttl => 0 => 0
apc.user_entries_hint => 4096 => 4096
apc.user_ttl => 0 => 0
apc.write_lock => On => On

any idea what I may have missed?