This doesn't fix the problem - I tried a bunch of stuff along the same 
lines and wasn't able to get this one solved.  I think your change is 
moving in the right direction though...

Are you running webtop for testing?

P T Withington wrote:
> [I can't replicate the failure in webtop with a small test case, but I 
> have tweaked the implementation here to remove what I think might be 
> 'cache hazards'.  Maybe you could test this change and see if it fixes 
> the webtop problem?]
> 
> Change 20090805-ptw-J by [email protected] on 2009-08-05 16:16:43 EDT
>     in /Users/ptw/OpenLaszlo/trunk
>     for http://svn.openlaszlo.org/openlaszlo/trunk
> 
> Summary: Tweak size_blank_to_zero implementation
> 
> Bugs Fixed: LPP-8367 Buttons disappearing in ie7
> 
> Technical Reviewer: max (pending)
> QA Reviewer: mdemmon (pending)
> 
> Details:
>     Be a little more careful about setting the sprite dimensions to 0
>     when there is no bgcolor or resource.  In particular, worry about
>     what happens if you re-set a dimension and the cache thinks the
>     dimension has already been set, but it has not because of the
>     quirk.
> 
> Tests:
>     I cannot construct a test case that duplicates what is happening
>     in webtop.
> 
> Files:
> M      WEB-INF/lps/lfc/kernel/dhtml/LzSprite.js
> 
> 
> Changeset: http://svn.openlaszlo.org/openlaszlo/patches/20090805-ptw-J.tar

-- 
Regards,
Max Carlson
OpenLaszlo.org
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