Wordpress not working with APC opcode cache on!??!?

Hi All,

We have a setup of 2 servers which runs our online applications:
(1) Front server we have a NGINX + VARNISH cache server which looks for new pages in our APP server, and/or responds with cached items.
(2) Below that we have the application server, a LAMP(centos 6) server: http://www.bodyscience.com.au/_info.php 

The issue we are having is the following:
========================================

-- We currently have a XCART shop, under /shop + a wordpress front site under website root.

-- Server previously ran Apache + eAccelerator in it.

-- We are now migrating to a MAGENTO shop, which is currently under development, on folder /shopdev

-- We have installed APC opcode cache to speed up magento store, but every time we active APC  and deactivate eAccelerator the following happens:
----> Wordpress website stops working, white screen, even though we make sure we clear the cache on server (1).
----> Magento shop speeds up MUCH MORE(3x) than before and php scripts get cached properly.

!!!!!Apparently Wordpress site only works if eAccelerator is on, but we need this OFF. Strangely, it works fine if we have both eAccelerator and APC on.!!!!!!

Please help, where do we go from here??

Thanks in advance!

eAccelerator Config:
------------------------------------
extension="eaccelerator.so"
eaccelerator.cache_dir="/tmp/eaccelerator"
eaccelerator.check_mtime="1"
eaccelerator.compress="1"
eaccelerator.compress_level="9"
eaccelerator.debug="0"
eaccelerator.enable="1"
eaccelerator.filter=""
eaccelerator.optimizer="1"
eaccelerator.shm_max="0"
eaccelerator.shm_only="0"
eaccelerator.shm_prune_period="0"
eaccelerator.shm_size="512"
eaccelerator.shm_ttl="0"


APC config
------------------------------------
extension=apc.so
apc.enabled=1
apc.shm_segments=1
apc.shm_size=512M
apc.stat=0
apc.ttl=7200
apc.user_ttl=7200
apc.max_file_size=20M