When updating from 1.5.3 to 1.5.4 I get the message that I will not get any support for this version and should downgrade to the next stable version to get any support. Well, since 1.5.4 is a stable version, I think this should be fixed.
I also got a querry when changing gallery settings that the convert path for Image Magick is invalid. Since I don´t resize any pics (other then creating thumbs) with cpg, I put a "/" in there and it worked... Not a real error, but maybe this should be made aware of as well.
known issue, see http://forum.coppermine-gallery.net/index.php/topic,65224.0.html