Safari doesn't load pages containing html5 canvas on iMac

Suddenly Safari either is very slow to load or doesn't load some pages at all.
I have tracked it down to be pages containing html5 canvas element.
This happens only on iMac and Macbook Air. It doesn't happen on iPad nor on Safari on a Pc. It will happen on the Mac computer both when the pages are out on the internet and when the pages ar locally stored. It's driving me absolutely mad!
I've tried emptying cache both through Safari menu and by removing Safari's Cache.db, I've reset Safari preferences, restarted, and changed DNS to Open DNS (though it seems strange it should be an issue since the problem also occurs when I run the site on localhost).
If I open the page directly entering the url in the adressbar it works fine, it is when I try to access it from a link on another page on the site it doesn't load. If I press reload it will load fine. The link from other pages can be either an html <a href="url"> tag or javascript window.location or window.location.href neither works. The weird thing is it worked fine until just yesterday. And it works fine on every other machine except the Macintoshes. WHY

Hi Carolyn,
Thanks for the quick reply. I've tried everything you wrote now, however the problem remains.
One thing I've noted though is that the page actually loads but it takes very very long time, and sometimes when the pages have been loaded the images doesn't look quite right until I hit the reload button.
I've been thinking about another thing, there are a lot of effects like round corner, shape and text shadow, can it be these that cause the problem? I still think it is very strange though that it all of a sudden stopped working and that running it on PC or iPad everything is just fine.
Another thing to add is that the computer is very new just got it like 2-3 weeks ago, and haven't hardly added anything except got Xcode, macVim, firefox and Filezilla.
Also just before the problem appeared I ran a page with javascript that had me caught in an endless loop of alerts. Got that fixed, but ever since that some pages won't load correclty...
Is there possibly anything else I can do to fix this?

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Please read this whole message before doing anything.
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Quit and relaunch the browser. Any change?
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Please read this whole message before doing anything.
This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.
Step 1
The purpose of this step is to determine whether the problem is localized to your user account.
Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”
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Test while logged in as Guest. Same problem?
After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.
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Step 2
The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, or by corruption of certain system caches.
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Welcome to the forums!
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(An explanation of why using Open DNS is both safe and a good idea can be read here: http://www.labnol.org/internet/tools/opendsn-what-is-opendns-why-required-2/2587 /
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Safari doesn't load pages containing html5 canvas on iMac

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