on photoshop CS2, i used to be able to use this command and now, for no apparent reason, i just can't, it's blocked. i searched on all the forums and tutorials i could find but still, i just can't. does the image i want to make a brush of need to have certain special qualities.. or something? i tried unblocking the layer, selecting the image, create new brush in the brush palette... anyway, i would really reaaally appreciate some help..