OpenERP 6.1 Latest Revision Ubuntu 12.04

There was a journal entry with more than 100 journal items, When I edit this and add line or delete line. After clicking on 'save' button the OpenERP gets stuck on Pre-Loader for around 5 minutes.

Why is it happening ? It breaks the flow of system.

• Some times after the pre-loader the edited part is saved and
• Sometimes connection broken may be due to the timeout and give XmlHttpRequestError

I have taken screenshots but cannot post them due to less Karma.

Arsalan