Sorry Melissa, I've not been able to fix this and Intuit doesn't seem to have a clue either. 

So let me get this straight, to fix this problem I could go into every single price rule and either make them inactive OR go into the price rule and uncheck all the items on it.  Too bad that doesn't work, even though it is harder than the previous example of turning off the Advanced Pricing.

And more importantly, this happens on every single item on every single invoice if the date was before the price increase and you change the date at all REGARDLESS if that item was ever used on a price rule or if that price rule is even applying to this invoice.  It doesn't matter. So doing the above 2 wouldn't do anything to fix the problem either.  The only work around I've found that works, is to go into single user and then to preferences and turning off price rules, running everything I need to do, and then turning it back on.  I have to stay late when everyone is off Quickbooks in order to do this.  Why can't they have a radio button or checkbox to LOCK the pricing regardless of any other changes.  Or some button to recalculate the prices to new ones.  It shouldn't be doing this.