Custom Workflow Activity not appearing in MS CRM 2011 Issue.

I created a Custom Workflow activity and deployed it in Development server.It was working correct .I deployed same assembly in Staging server and I was surprised to see that assembly was  not showing the workflow which I added. Although It was shown in plugin registration tool.

Solution 1: Problem was in Strong name key.I created a different Strong name key and updated the  Custom workflow assembly.I unregistered the old assembly and registered the updated one.
It worked like a  Charm.

Solution 2: As suggested by Philip Update the AssemblyVersion and AssemblyFileVersion.
check  below link
http://blog.philipverlinden.be/crm/newly-added-custom-workflow-activity-not-showing-when-adding-a-new-step/


Hope this helps.