Not Entering Location

Hi

I am currently working with a client and am having issues when using the Geo mashup plugin. When I enter a postcode and then select save location, the page returns to the top, its says that the post has been updated however there is no change to the geo mashup area on the post or on the frontend.

I have the latest version of wordpress and the plugin

Any Ideas??

Thanks

Sam

http://wordpress.org/extend/plugins/geo-mashup/