APC with horde/imp: 99.9% miss rate and only one cached file

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I suspect I've either done something horribly wrong or found a weird
bug, probably the former. I'm running PHP 5.2.13 on Solaris 10 under
Apache 2.2.14. Memory usage is 98.8% free (default 1 slice of 30MB).
Here are stats on the cache:

Cached Files			1 (288.2 KBytes)
Hits				4146
Misses				3579033
Request Rate (hits, misses)	358.68 cache requests/second
Hit Rate			0.42 cache requests/second
Miss Rate			358.26 cache requests/second
Insert Rate			0.00 cache requests/second
Cache full count		0

And here is my config in php.ini:

extension=apc.so
error_reporting = E_ALL ^ E_DEPRECATED
apc.report_autofilter = 1
log_errors = 1

If I restart apache, a different file gets cached each time (it rotates
between a very small subset of all of the PHP files in horde).
Sometimes, 2 or even 3 files get cached, but I've never had it go above
3. I've been googling around and reading the list archives but I can't
find anything that seems to be related to this. Am I misunderstanding
the purpose of APC? I thought that it would attempt to cache all PHP
files that are requested.

I turned on the report_autofilter in an attempt to diagnose the issue,
but nothing shows up in the error log. Here is the config as shown by
apc.php:

apc.cache_by_default		1
apc.canonicalize		1
apc.coredump_unmap		0
apc.enable_cli			0
apc.enabled			1
apc.file_md5			0
apc.file_update_protection	2
apc.filters	
apc.gc_ttl			3600
apc.include_once_override	0
apc.lazy_classes		0
apc.lazy_functions		0
apc.max_file_size		1M
apc.mmap_file_mask	
apc.num_files_hint		1000
apc.preload_path	
apc.report_autofilter		1
apc.rfc1867			0
apc.rfc1867_freq		0
apc.rfc1867_name		APC_UPLOAD_PROGRESS
apc.rfc1867_prefix		upload_
apc.rfc1867_ttl			3600
apc.shm_segments		1
apc.shm_size			30
apc.stat			1
apc.stat_ctime			0
apc.ttl				0
apc.use_request_time		1
apc.user_entries_hint		4096
apc.user_ttl			0
apc.write_lock			1


Any help would be greatly appreciated.

Thanks,

Derek

-- 
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Derek Chen-Becker
Senior Network Engineer, Security Architect
CPI Corp, Inc.
1706 Washington Ave
St. Louis, MO 63103
Phone: 314-231-7711 x6455
Fax:   314-613-6724
dbecker@xxxxxxxxxxx
PGP Key available from public key servers
Fingerprint: E4C4 26C0 8588 E80A C29F  636D 1FBE 0FE3 2871 4AE8
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