Description:
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The hits for System cache shows shows always 0 on Linux system. On Windows system works correct.
I tested with 3.1.3p1 on Windows and 3.1.3p1/3.1.4 on Linux.
The acp.php is same on both systems.

Linux System:
APC Version	3.1.4
PHP Version	5.2.11
Server Software	Apache/2.2.8 (Linux/SUSE)
Shared Memory	1 Segment(s) with 64.0 MBytes
(mmap memory, pthread mutex locking)
File Cache Information
Cached Files	144 ( 28.4 MBytes)
Hits	1
Misses	144
User Cache Information
Cached Variables	2009 ( 4.8 MBytes)
Hits	76164
Misses	22856

Window System:
APC Version	3.1.3p1
PHP Version	5.3.1
Server Software	Apache/2.2.14 (Win32) DAV/2 mod_autoindex_color PHP/5.3.1 mod_apreq2-20090110/2.7.1 mod_perl/2.0.4 Perl/v5.10.1
Shared Memory	1 Segment(s) with 32.0 MBytes
(IPC shared memory, file locking)
Cached Files	63 ( 12.7 MBytes)
Hits	261
Misses	64
User Cache Information
Cached Variables	24 (157.9 KBytes)
Hits	97
Misses	77

php.ini:
apc.enabled=1
apc.shm_segments=1
apc.shm_size=32
apc.ttl=0
apc.user_ttl=0
apc.enable_cli=0
apc.cache_by_default=1

Fel