>         <span macro="hideWhen [[tiddler.tags.contains('Locked') ||
> window.location.protocol!='file:']]">
>                 <span macro='toolbar cancelTiddler'></span>
>         </span>

Ah hah!  It turns out that the handler() code for the hideWhen macro
actually uses the entire 'paramString'.  Thus, the surrounding
[[ and ]] are *not* needed (and, in fact, prevent the boolean
expression from being properly evaluated.

Try this:

<span macro="hideWhen tiddler.tags.contains('Locked')||
window.location.protocol!='file:'">
   <span macro='toolbar cancelTiddler'></span>
</span>

Also, for future reference, the boolean operators are:
   &&=AND, ||=OR, !=NOT

enjoy,
-e

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