So this blogger business has been fixed! For those not pantydeep in the Regretsy forums, I posted a plea for help since blogger was acting the bish. Turns out it wasn't CSS or some other arcane code mumbo jumbo. You know what it was? A photo I uploaded in a post was too large.
Yea. I was actually drawn to tears because, in the course of trying to fix my sidebar yesterday, I totally messed up my blog. I thought it would never be the same again. So thank you Kim, RJG and angel drawers for your help!