There are several reasons why that gain could be not appearing on form 8582 - most of which are there on form 4797. Is the gain showing up anywhere else in the return? Has it been classified correctly?
You are probably better off having someone walk through the return with you to look at your entries so I recommend getting live expert help.
Here is a link to finding a TurboTax expert.
However, that requires upgrading your product which may be an expense you don't want. In that case you can call an expert and ask questions over the phone.
Here is a link to the TurboTax Phone Number.
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