Hi. Just starting to play with object states. Found some cache issue setting states from the "view states" template, i mean from "design/admin/templates/states.tpl".

If you have your "object states" tab enabled and set the states of an object from the view template of the node, you will not notice the changes if you not delete the view cache of the node.

Quick fix could be change the last lines of the updateObjectState function in kernel/content/ezcontentoperationcollection.php file from

 //call appropriate method from search engine
eZSearch::updateObjectState($objectID, $selectedStateIDList);
return array( 'status' => true );

to

 //call appropriate method from search engine
eZSearch::updateObjectState($objectID, $selectedStateIDList);
//added to clear cache
eZContentCacheManager::clearContentCacheIfNeeded( $objectID );
return array( 'status' => true );

Best wishes.

Steps to reproduce

Create a states group.
Create some states inside that group.
Enable your object states tabs. Choose a node and try to change the states not editing the content.
You will no see your changes if you not clear the cache.