I did search to see if this had been mentioned before but I cant find it.
When you click on the send image button when the gallery is in slideshow mode the form appears and the image you selected appears as a small preview (as it should). However, by the time you have filled the form and sent the link, the gallery (although it "pauses" on the image you selected) has moved on by x amount of images and the wrong image link has been sent.
Apologies if this has been mentioned before.