unfortunately they are not currently good at wdw. On my points:
go to spend points,quicklist, click on csi universal amusement ticket catalog,directory, you can then choose the state you are looking for and it will give a listing of where they can be used at.
I had called CSI before we ordered our tickets through my points and she told me that the expiration date is 10 months from the date you order them. So I think it is always 10 months.
I am not aware of any blackout dates. I would think they would be sent with the card if there were any. Nothing is stated on the cards or the folder they came in.