First off congrats on your product.
It does take some tweaking (and time to learn) but I am asking it to do a lot. 1,000,000 plus page websites and 48 hours plus running time.
I have noticed that if I try to go directly to the "crawling page" by typing in the address from the address bar (dropdown pre-populates it from previous visit) it usually does not load successfully. I have seen other posts about this.
I can most always get a successful "crawl page" load by:
1. go to generator home page...........www.your-domain.com/generator
2. Click the "Crawling" tab.