I'm sure this is far from the first time this issue has been brought up, but the attachment manager has become more than an annoyance to me lately..
I was attaching a bunch of pictures in my sketchbook, when all of a sudden all the images i was attaching were gone, only the last one i uploaded was there.. Then after reuploading ten or so of them all of ca went down and took my images with it, just as i posted. The back button saved the text, no luck with the images.. So yeah, frustration is an understatement.
Normally i don't have a problem with the tedious insertion of all the info of every image, but when i have to do it three times for a bunch of images it becomes REALLY tedious. It would be awesome to save a couple of presets, so one could automatically fill in info thats used often. (like sketchbooks - observation - photoshop etc.) Saving custom presets and naming them would be a super welcome feature. I'd trade my gallery page for that feature any day of the week!
Right now, to be safe, i'm uploading a few images, saving, editing the post to add a few more, repeat until done. Its not really ideal, and discourages posting any more than a couple of images at the time.
Batch uploads where you would input the copyright and category info to apply to all selected images would also be heavenly!
//edit: As for why my uploads suddenly disappeared the first time, i have no idea. But if it helps troubleshooting i'm running firefox on windows 7 64 bit.