Why did IE autocomplete stop working after updating an aspx page?

I changed some text on an .aspx page to reflect a new phone number. No other changes. Did not update any .DLLs on the web project. Now users complain (I've verified) that IE's autocomplete feature i开发者_运维知识库s no longer working. I've turned on autocomplete, reset defaults, etc. to no avail. No server settings for headers were changed. Appears to affect SSL and non-SSL environments.