As to your zoom problem, you need to tell me exactly what's happening beyond "can't zoom". Are you getting a blank page on the preview zoom? An error message? A preview for a different skin?
Nope, i get the same web page (as if i didn't click to Zoom ...) Look closer to the shot i took, it's the same web page but if you look at the URL in the address bar it should be the "zoomed" page
BTW, i've tried different things, clearing again my web cache, deleting cookies and so, and it seems to me that this specific trouble is perfectly reproducible each time i enter Wincustomize at the URL http://www.wincustomize.com/skins.aspx/ (which is the way i use since the begining of earth

)
If i enter at http://www.wincustomize.com then browse to skins the trouble doesn't exist
About the error concerning impossibility of using the email feature in users profile, i think it's probably because some users have not left an email adress, i just succeed to use on some other users ... but when it happen, here's the web page i get:
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Server Error in '/' Application.
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The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested URL: /lgspence/lgspence/email.aspx
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Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433
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And finally (for now

) i can assure you that the right click on the download button of any skin works for me.