I'm a first-time user of nuBuilder as of this morning, and I have to say, amazed to have found your software. Working on a project for a client and this is exactly the "saving throw" their project needs.

I'm sad, however, to report that 2.7.4.5 (at least when running on a Mac OS X Mountain Lion standard Apache+PHP setup with official distribution MySQL server) has an error in my setup where every breadcrumb link (including the "home"-type link) produces a 404 error (appears to be trying to go to a partial query string on the root level of my Apache installation when looking at the URL in the browser location bar). Everything seems to work other than the breadcrumbs.
Is this a known issue with the latest release, or, is there some common issue that can lead to this problem? Also, just to re-iterate, I am NOT using MAMP in my setup, I am in fact using Apple's "genuine" Apache+PHP distribution (shipped with Mountain Lion) along with a stock MySQL server distribution for Mac OS X.
Also, if I can provide more specific detail, please just let me know what you need. No need for hand-holding on information-gathering either, just say what you need, and I'll gladly provide it.

Cheers!
Zed