ECB layout hooks cause frames to be split twice on show-buffer

With emacs23, activating ecb causes problems whenever a frame needs to be split for show-buffer (e.g. to show help or completions). Instead of ending up with two side-by-side buffers, I end up with the frame split vertically, then the top half split horizontally, with the new buffer shown in both the top-right and bottom splits. (I hope this is clear - if anyone would like a screenshot, let me know.)

I have attached a patch against ecb-2.40+cvs20110608, generated with git format-patch against commit 317be2c36e6dd67dab37f3bb22da37a6902032e3 in the git repo git://git.vireo.org/ecb.git . Packages including this commit can be found for maverick and lucid in my PPA - https://launchpad.net/~awg/+archive/emacs-updates/ . I have tested it only with the oneiric version of emacs23, backported to lucid and maverick.