Okay! That worked. Let's try another 3 images. I suspect the attachment rules are, (1) a maximum of 1024KB for any individual attachment, (2) a maximum of 4 attachments, (3) a total size for all 4 attachment no greater than 2048KB.
The first 2 images are the frames that were stitched, showing plenty of everlap. The third image is the result that CS5 Photomerge produced automatically. Free Transform and Distort easily fixed that.
Sometimes, with hand-held shots, I find it necessary to use 'free transform' and 'distort' on individual frames prior to stitching. Sometimes, particularly with more than one row of images, it's necessary to do a progressive stitch, ie. stitch together the first two images, one from each row, then the second two image from each row, then the third and so on. With two rows of 3 images, one then has just 3 images to contend with. These of course need to be cropped before stitching again, so one should always try to allow for a good overlap when taking the shots.
Sometimes it still doesn't work, and one might have to stitch together the first and second pair, then the 2nd and 3rd pair, crop again, and finally stitch together the two final images consisting of the 1st and 2nd pair, and the 2nd and 3rd pair. Whatever works.
Of course it would be better to avoid such hassles by using a tripod and pano head in the first instance. But sometimes that's just not possible, or may be simply too inconvenient. The ability of software such as CS5 to seamlessly and automatically stitch hand-held shots of close subjects is a huge advance on early stitching programs.