I'm assuming you mean Classic boards with Fix versions( since that's what Classic boards are using)
JIRA Agile 6.7 will remove the classic boards according to the release notes ( https://confluence.atlassian.com/display/AGILE/The+Future+of+JIRA+Agile ):
"Classic boards will be removed in JIRA Agile 6.7 (scheduled for March 2015). This means:
Sprint tracking makes more since in a Scrum version (rather than abusing FixVersion) since it does free up the Version fields to be used for Versions... What exactly are you trying to do? Have you tried to use the Kanban boards?
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