ISPConfig 3 ip:8080 Suddently Blank Page

I Just install Latest ISPConfig 3 + debian squezze. It work oke until sometime my new CMS error "Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 91947380 bytes) in /var/www/clients/client1/web1/web/system/xxx/xxx/xxx.php on line 526"

Then i do:

1. upgrade php.ini memory_limit = 256MB using vi /etc/php5/apache2/php.ini
2. then /etc/init.d/apache2 restart
3. and then ip_address:8080 BLANK PAGE "HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request."
4. I bring back php.ini to memory_limit = 128MB
5. then /etc/init.d/apache2 restart
6. shutdown the server, reload apache twice but still no luck

note:
the domain, ftp, mysql etc is working fine except ispconfig:8080

any help appreciate.

 

I have same problem with mine too, tried everything, except mine is on centos, all was ok until i update ispconfig and internal server error now too

 

Sorry this is absolutely my mistake shoukd be memory_limit = 128M (Not 128MB)