With the v1.2.10 update, I get the following every time a user tries to register on any browser.
"Invalid Token"
Searching through the forums gave me:
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In both of my instances I was able to find the form that was the culprit. It was just a matter of finding the code and making sure it I added this just before closing the form tag:
<?php echo JHTML::_( 'form.token' ); ?>
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I added the tag after </form> tag in the default.guests.login file and the problem appeared resolved. Maybe it's something you should add to the package permanently?