I am trying to use sigpro for a gallery in K2 items. The gallery is set to media/K2/galleries,  no underscores or strange letters in the name of the photos or the zip file. The photos/gallery are present in the edit in admin but will not show on the live side of the site. All levels are set to display gallery . Can anybody advise?

Could you provide a link to your site and PM me access to your administration?

Very very important:
Haven't you noticed that the K2 component is broken inside the items in the backend? You need to re-install the component.

Now the SIG (free) doesn't have to be enabled (I took the liberty to disable it), in fact doesn't have to be installed at all once you have SIG Pro. I changed the path inside SIG Pro to the right one, which is the default (images/stories). K2 doesn't use this path anyway. The path is if you want to use the tags {gallery}{/gallery}.