loading tabs error

[keitaro]

Hello today i added many new items to the shop.

 

I took a break and added some more, then suddeny i get this error

 

Some tabs was not loaded correctly. Would you like to reload them?

 

clicking yes just loops eternally clicking cancel then choosing a tab gives a blank page.

 

I have added a preorder module on the weekend but it was working till now.

 

 

 

i checked the forum but i could not find anything tht fixed my issue.

 

Error logs show no problem reported.

 

please help

Server information

 

Server information: Linux #4 SMP Wed May 15 19:43:53 CDT 2013 x86_64

Server software version: Apache

PHP version: 5.3.24

Memory limit: 256M

Max execution time: 30

Database information

 

MySQL version: 5.5.30-30.2

MySQL engine: MyISAM

Tables prefix: ps_shop

Store information

 

PrestaShop version: 1.5.4.1

Current theme in use: default

Mail configuration

 

Mail method: You are using the PHP mail function.

Your information

 

Your web browser: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0