I had this exact situation as well but in my case saving a password did no good. So I entered 127.0.0.1 as an auto-login IP address and now the default domain will stick in the database. (Actually, I saw it in the database but it never hydrated back to the page.)

Cheers.
Weezy

I know that this is sometime after the original post was created but I have had problems too whereby the 'Default Domain' setting was not working - and the good news is that I've managed to fix it.

Essentially, I had to download the source code and do a bit of debugging. At this time I'm using the latest version (v05.00.06.2) and there appears to be a problem in the solution file:

Components\Config\Configuration.vb

Line 113:

mAutoIP = CType(Null.GetNull(CambrianSettings("AD_SubNet"), mAutoIP), String)

throws an exception and as a result, the code fails to read the mDefaultDomain property (and a couple of other properties too). I've not had a chance to investigate it fully but I fixed it by moving the problem line to the bottom of the function (it could probably be removed as I can't see an AD Subnet option on the configuration screen). It still throws an exception but by then we have read all of the remaining properties.

I know that this fix is not much use if you're not a software developer so hopefully this post might result in a more permanent fix.

Thanks