Thread:Project:Support desk/Unexpected breaks in HTML before closing tags/reply (4)

I still don't see why you should rely on particular whitespace on the HTML markup. But anyway, be sure that you've also set the other related TIDY variables, specially $wgTidyBin, to a working tidy binary. If TIDY is not present in the machine and MediaWiki is unable to locate it, $wgUseTidy is useless.