I have a Fix Version/s field configured. It is marked as editable, and can be edited from my Edit screen. However, the field cannot be in line edited from the issue details screen.
Other fields can be in line edited without any issue. This is what it looks like: http://imgur.com/a/Ne1N5
Are you using the Behaviors plugin? If yes, do you have any behaviors configured that are associated with the Fix Version/s field? Associating a behavior with that field turns off the inline editing, so I thought I'd ask to see if that might be the case.
Otherwise, not sure why this would be happening.
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