In that update, eBay is changing its policy concerning links that lead to off eBay websites. This includes the SixBit tagline link. Links to 3rd parties from tagline links are no longer allowed after September 2017.
We had a heads up that this was coming so in our recent full release we have removed the link from the tagline. Any new listings created with version 3.00.200 or later will no longer include an offsite link. Any listings created with earlier versions will have the link. When the cutoff arrives in September, any listings that were created with an earlier version can be fixed simply by installing 3.00.200 or later and performing a batch revise on all the older listings.