Visit the Bearlodge Writers
The following link is to a post written by Laurie Pawlik-Kienlen at The Adventurous Writer blog. She created the list from comments made by editors, agents, and publishers attending the Surrey International Writers' Conference.
Though the list was posted awhile ago on the AW blog, Chuck Sambuchino, editor of Writer's Digest Guide to Literary Agents thought it worth circulating again.
(Not that any readers of the BLW blog have any of these problems with their book manuscript, no siree, just some helpful info to pass on to those writers who are having some trouble.)