Some php pages do not load properly after install

[Centurius]

First of all some general information on the install:
Centos 5.5 32 bit
Cpanel
Litespeed 4.0.20(Trial) as main httpd with apache in the backend to handle ssi and such
LSAPI to handle php

I've installed litespeed on my server yesterday however I noticed that certain pages(specifically Wordpress) didn't load properly after the installation(see below), when switching back to apache this was no longer an issue.

http://data.treksimming.com/wordpress-error.png

Initially I thought it was just an outdated cache on my side or something like that as it only happened to some sites however later on visitors started reporting the same issue. After that I looked into the php handler to see if that would solve the problem, however even changing it back to the basic cgi had no effect on the websites that had errors.

Does anyone have experience with this or a similar error? And if so, what helped solve it?

Edit: Removed the screenshot and just made it a link as it did not resize.

[NiteWave]

this may due to some pages are compressed twice.

you can disable gzip in litespeed for a quick test.

lsws admin console->
Server->
Tuning->
Enable Compression:No

[Centurius]

I tried however I am afraid the error remains.

[NiteWave]

wget http://beta.telara.nl/
return correct text.

curl -iH "Accept-Encoding: gzip" -o t.html http://beta.telara.nl/
has problem: the content is gzip'd but header has no "Content-Encoding:gzip" header.

need further information to identify the cause. it's related wp-super-cache with litespeed. you can try disable wp-super-cache to see if this site working fine in browse. or simply off/on wp-super-cache when litespeed is running, to clear the cache.