Starting Over . . . Again

Scrapping a book is tough, but sometimes a writer has to do it. I'm dumping only about 50 pages, but many authors dump 100-250 pages and start over. I'm lucky in the sense that a small publisher took interest in me. She liked my writing voice in LC though it didn't fit their imprint, and she wanted to see my next endeavor.
I wrote, tweaked and edited a submission and sent it to her. I sensed there was something wrong with it, but I didn't know what. I got a response a few days later, and it wasn't good.
It was all backstory. There's a reason it's called BS, people!
Yeah, when she so kindly pointed out my problem in a two page run down, I knew I had to start over. I find it disturbing that I can spot BS in other people's work, but not my own. I guess I'm just too close to the subject.
Anyhoo, I thought about it and started writing yesterday morning. Now, just because I'm scrapping my beginning doesn't mean I can't use some of my scenes or plotline, I can, though totally rewritten. And I intend to. But what I found interesting is that by simply rewriting the first page I discovered something very important--I discovered the reason for this story.
Oh, I thought I knew what was going on, but one of those simple sentences that I wrote triggered the whole thing to come together in my mind. So I'm off to write--I just had to get the stupid out first.
Don'tcha love it when it all comes together?
Write on!