Drupal not updating data for content page

I am using Drupal 6.19 to build a simple website with its own theme and layout. I also added and updated content regularly till I ran into a typical problem yesterday. There was a node-24 with a url alias of 'projects/india/current'. It is a content of type 'page'. As soon as I updated the content for this node, the data was not saved but it went to the url http://www.example.com/node/24/edit?destination=开发者_运维技巧admin/content/node and the home page got displayed instead of normal update successful message. When I click on the back button I again came to the edit page options. It seems the data is not getting saved. I erased the body part of the content entirely and just typed 'test' and pressed the save button and to my surprise it updated successfully. I am not sure whats happening behind the hoods. I am using input format as PHP code. Any help would be highly appreciated.

Thanks

just check the node the data might have been saved. due to load on server at times this happens check your logs if you are getting ERROR 500 at times