As as user with power level or greater permissions you can clone the dashboard then share the clone. Otherwise your user needs elevated permissions to be able to share out his dashboard.
I don't see any known bugs like this in the 6.1* release notes. Can you try to find the defect # for this bug? Otherwise my instinct leans me towards app level permissions.
Out of the UI, you gotta get it out of the users directory and into the app directory. May be best to simply copy and paste the dashboard XML into a new view instead of devote too much time to it.
access = read : [ * ]
export = none