The most common problem with posting pictures to a gallery is that the pictures are too large. Most modern cameras can produce images that are several megabytes in size. If these are posted onto the site, it can overload the image processing software, and will quickly use up the disk space allocated to this site. The solution is to reduce the image size to 640 x 480. You can do this using the software that comes with most cameras. If you look in the help for your cameras image management program under "image resize" you will find instructions on how to do this. If you still have problems post a question here using the Add new comment link.
Picture too small!
It is possible to post pictures to the gallery that are too small! If the image is less than 640x480 then only a thumbnail is generated. When you click to view the full size image there is none. The solution is to make sure your images are at least 640 x 480. If they are an odd shape try to make the smallest dimension 640 and the image processor will re-size the image when you upload it.