bookmarklets not executed in IE7 blank page?!

[mbisping]

I have the impression that bookmarklets aren't executed at all if
InternetExplorer 7 is at about:blank.
I'm trying to develop one that makes sense in that circumstance.
Is this a security issue? Is there a workaround?

Thanks for any hints.

Meikel

For testing:
javascript:var%20dt78KwZ9=new%20Date();alert(dt78KwZ9.toLocaleString())