It's unlikely that <<hideWhen>> itself is broken in FF4 (though it could be). However, the macro uses javascript eval(...) to process the macro params as conditional "code", so it's more likely that some specific usage in your document is failing in some way. Can you can create an MTC ("minimal test case") document and post it online so we can look at it?
-e Eric Shulman TiddlyTools / ELS Design Studios -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To post to this group, send email to tiddlywiki@googlegroups.com. To unsubscribe from this group, send email to tiddlywiki+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/tiddlywiki?hl=en.