Does the weird behavior for the account settings dialog where no callback number shows up happen immediately after login or after having DC open for many hours?

If the latter then the problem you had with configuring the callback number is most likely due to a bug caused by the session with the server expiring. The one time I saw it, I worked around it by closing and re-opening. I fixed that bug and pushed the build but it seemed to have disappeared on the server for Maemo 5.

If the former, them I am still confused.

When you press Ctrl+l it just copies the log text. You need to paste it somewhere. Did that not work? If you feel comfortable with a command line, the log can also be found at "~/.dialcentral/dialcentral.log".

There is still an issue with the server timeout though, its just hard to reproduce so I haven't done too much testing with it. I'm guessing you might get it to work by re-logging in. Or you can always close and re-open. With all of the caching of data DC does now, that shouldn't be too much of a problem.