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My preview was not working after updating and then I discovered my webversion was not working either. After some debugging I was able to locate what I assume to be a bug because I was able to fix it.
Line 27 of short.php is:
I think it should be:
return intval($in, 36);
This fixed resolved my issues.
Thanks for posting this. It's been addressed in 188.8.131.52 in which I just released http://sendy.co/get-updated