That macro was news to me. I find it heere: $:/core/macros/thumbails <http://tiddlywiki.com/empty#%24%3A%2Fcore%2Fmacros%2Fthumbails>
The first line of it is: \define thumbnail(link,icon,color,background-color,image,caption,width:"280" ,height:"157") i.e to me it seems that it expects as its first argument a link, i.e which tiddler that it should link to. You can try to make this empty like so: <<thumbnail-right image:"" "Tiddler Poster.png" >> ...or, better, make it link to http://tiddlywiki.com/#HelpingTiddlyWiki <:-) -- You received this message because you are subscribed to the Google Groups "TiddlyWiki" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/tiddlywiki. To view this discussion on the web visit https://groups.google.com/d/msgid/tiddlywiki/cb16618d-ead0-45a4-a7db-038b6ac91611%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.

