We are trying to upgrade from 7 to 10. Why do forms that post to themselves display a blank page on the screen? Viewing the source of the blank page in the browser shows basic html, head and body tags with no contents plus the doctype comment and a meta tag. These didn't come from the page posted to but the right url name is displayed and there is no error.
Do you have more than 100 form fields in the FORM?, if so you might need to increase the postParameterLimit in ColdFusion admin (defaults to 100). More about that setting here: http://www.petefreitag.com/item/808.cfm
It appears to be one of the case-sensitivity problems.
Page extensions in Coldfusion 10 by default are case-sensitive
so .cfm is not the same as .CFM
This is the bug report with a workaround