I clicked on "Edit Offline" and got:
Please correct the errors below then click OK.
* Unable to check out Content Node due to system error:Transaction didn't commit: 01050007 Failed to send email to:[documentationmailinglist]
The file did in fact download, and there is no OK link of button.
The Custom view shows that it is still not "locked", but the Details view has my name on it as 'modifier'.
Please help.