Ukelele generated custom keyboard layouts not working in Lion?

Question

I asked this question in the stackexchange site a few days ago.  Nothing I've tried has worked so far, except for creating a new account.  Because a fresh account works, it's got to be something with my preferences, right?
http://apple.stackexchange.com/questions/21691/ukelele-generated-custom-keyboard -layouts-not-working-in-lion
Here's the question from above:
I created a custom keyboard layout with Ukelele (http://scripts.sil.org/ukelele) in Snow Leopard (idea is to generate scandinavian letters with Alt-key, otherwise have a pretty much standard U.S. layout). After the upgrade, the old installed (to ~/Library/Keyboard Layouts) layout wasn't working.
Ukelele seems to work OK in Lion, but whether I put the generated keylayout in a bundle or single file, or save it "/Library/Keyboard Layouts" or "~/Library/Keyboard Layouts" doesn't seem to matter.
Help?
EDIT:
@Sergio, I cannot choose the layout in Input Sources. One keylayout file I tried:http://semeai.org/~sjl/us-scands.keylayout
[EDIT: Removed unrelated stuff]
UPDATE 2011/08/15:
@Tom:
Copied your keylayout (it naturally ended up in my Junk folder):
midgard (01:55) >ls -l ~/Library/Keyboard\ Layouts/MongolianQWERTY.keylayout-rw-r--r--@ 1 sjl  staff  44536 Mar 13  2008 /Users/sjl/Library/Keyboard Layouts/MongolianQWERTY.keylayout
Logged out, logged in, isn't showing in Input sources (I'm looking very closely between "Maori" and "Myanmar - QWERTY").
I've also uninstalled bunch of software and plugins giving suspicious messages to system.log, but hasn't helped.
UPDATE 2011/08/16:
I created a test account, and lo, the layout works perfectly for it. Also the bug in preferences doesn't show for that account. When trying this on my own account, there are no errors in Console logs with the suggested keywords (I can't seem to locate console.log file, though).
UPDATE 2011/08/16 later:
Nuking Library/Caches (and relogging) didn't help.
UPDATE 2011/08/17:
I did
% find Library -name "*.plist" -exec mv {} {}.renamed \;
and restarted, but it didn't help. I restored the situation with
% for file in `find Library -name "*.plist.renamed"`; \  do mv "$file" "${file//.renamed/}"; done
addendum: I also went through all the .plist files with plutil -s as described inhttp://www.askdavetaylor.com/can_i_check_my_plist_files_in_mac_os_x_for_problems .html. There was some brokennes, but in very unrelated applications.

Answer 1

Tom,
I think I love you.
That absolutely did it! Thanks so much!
If you'll answer with the same link in the stackexchange site, I'll mark the answer as correct, so you'll get the rep there.
Thanks,
Sami