Yep, you have given us smart folk (1) ;-) enough information. So this happens on Firefox and Safari? It seems like you're in firefox there, so that's interesting... I'll borrow my roomate's mac and see what I can figure out.
Until then, you can FTP images just as easily (and I think, much more easily). Just create a folder in the /albums folder for the album, pop the images in, and they're instantly in the gallery. You can edit their metadata in the control panel too.