Hi,
In our project, its not currently possible to resolve or close an issue, as workflow buttons do not appear. Moving the issue to another project and back did not help. Integrity checker reports no errors. Workflow has transitions marked Resolve from the current issue status. Changed to the standard, read-only Jira workflow, and still have the problem. Here is a screenshot showing the missing Resolution functionality: 
Can someone please help me? Thanks.
Thanks,
Jon