We’re working to resolve the issue with the “’” (%27) character now. The docs for the buttons will be updated a little later this morning. The old button is no longer, there is only the new button now 
@OllieParsley: Can you share the exact HTML you’re using to declare your Tweet Button where the datacount-url and data-url is being mixed up? Also, a link to the page online? Thanks.
We’ve been very careful to limit the amount of issues this upgrade may cause, but with the multitude of implementation scenarios and browser combinations, there will likely be a few minor issues here and there that we missed. We’ll be as swift as we can in resolving them.