At this very moment, no. The Gallery we used to use is only available on vBulletin (which we ditched, because it stinks, is outdated, and with every new release, the mess grows bigger). Well, that is technically not entirely true, as a bridge was made, but it looked horrible, and integrated very poorly into XenForo. Rather than settling for a half-baked product, we chose to just wait for a proper XenForo Gallery solution, and we're working with some of the developers working on exactly that. I apologize for the inconvenience.
Try again. During the upgrade, our signature uploader somehow ended up being removed when I updated the templates. Please ignore my previous comment above. I have ended up disabling the uploader again.
Try displaying it in a regular post. - click "Upload a file" right of the "Post Reply" button - click "Full Image" right to the uploaded image
Well then, this post is so I can upload my new forum sig. EDIT: We've got a new signature now so I'm editing this post in order to upload it :)