after years of no issues with my Textpattern installtions I am getting errors regarding clean/tidy URLS? Given that this issue has only arisen lately has something changed on the Opalstack servers?
If clean URLs are not working it may mean either:
the ‘Site URL’ setting is incorrect, or the page at that address is not managed by this instance of Textpattern
the server requires some changes to .htaccess or similar server directive in order to make clean URLs work
the server doesn’t support clean URLs at all