Custom module role not save in Permission magento
In magento many people trouble from this issue. Here i have done mini patch in config file.
Open the config.xml of module and overwrite the below code of <acl> section and replce the name of your module.
Here is my acl section of config.xml
<acl>
<resources>
<all>
<title>Allow Everything</title>
</all>
<admin>
<children>
<banner translate="title" module="banner">
<title>Banner Module</title>
<sort_order>10</sort_order>
<children>
<banner translate="title" module="banner">
<title>Manage Banners</title>
</banner>
</children>
</banner>
</children>
</admin>
</resources>
</acl>
Also add the below function in your controller to avoid the "Access denied" message
protected function _isAllowed(){
return true;
}