Yup, i had this problem in my last run through. I found it to be quite picky where you stand in order to activate it, try moving about underneath it. That fixed it for me: even though it didn't pop up with the message saying 'you are too far away to use this', it wasn't working.
Failing that, either a sleep or use the autosave will fix it. I know i didn't have to do anything drastic to make it work..
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