With the latest one you posted, I was able to load the lisp without problems. Only the small issues I saw that I mentioned in my other post. Other than that, great job James.
I was wondering if you want to put a toggle button, or something like that, so that people can switch between blocks stored within folders, or blocks stored within drawings. If you want something like that, then I will see how to code it up if you like, with what you have.