Hello Michael C -
We have become aware of an issue with custom item specifics showing appropriately on the Lister page and are looking into the issue. From reports we've seen it appears that this may be related to using an Ad block extension in your browser. You may find the page loads correctly if you use a different browser, disable the ad on or put our site on the white-list for your extension (if you are using one).
If you have tried disabling the extension and using another browser without any addons and the problem persists for you, please let us know the details of which browser you are using and if you have any add-ons or extensions enabled in it in a support case (you can file a case at any time from under the Help tab of the site) so we can look into this further.