Everytime I do an upgrade of WP, my post preview has failed. The 2.6 upgrade I thought would be better, but it's been the worst of all.
In versions of WP prior to 2.6, my pain in the rear problem was that the preview links always referred to URLs of the format http://mysub.mydomain.com?p=<#>&preview=true. The way I got that to work was to hack the source so that it instead always pointed to http://www.mydomain.com/mysub/?p=<#>&preview=true. For some reason, that always worked when the former didn't.
Well, in WP 2.6 is it looks like they not only make post preview fail for me with its URLs of the format http://mysub.mydomain.com?p=<#>&preview=true. Now I try to type in or force a URL change to the format http://www.mydomain.com/mysub/?p=<#>&preview=true and that now *also* fails as well, giving me a "Oooops...Not found !" 404 error. The original ttp://mysub.mydomain.com?p=<#>&preview=true format URLs give me a "Not Found - Sorry, but you are looking for something that isn't here." error. So now I am screwed on both counts without a way to access a URL to view a preview of my posts.
Is there a new URL format I should be using to get anything to appear right for previewing?