Heard about this from another Sixbit user via Facebook Group:
“Due to a new development with eBay that we are currently investigating, new listings are going up to eBay without the Description.
In SixBit, click File > Options > Submitting Listings and uncheck the option to “Set the contents of the Description field as the default mobile description.”
New listings should go up with the correct HTML. Existing affected listings should be fixed by highlighting them in the Check Listings > Running mode and right-click Send Revisions to Site.”
Thank you,
Clay McCarty
SixBit Customer Support