Hello All -
I am sorry to hear about the issues you have been experiencing with the newer version of the description editor. Please be aware that this change was introduced for a few reasons - primarily because the older version of the editor had become a security risk and it was also failing to operate entirely on some contemporary browser and operating system configurations.
Please be aware that the Red Line you have encountered is a formatting tool inherent in the editor that makes it easier to place cursor and add content near some problematic document elements like, for example, images, tables or <div> elements that start or end a document, lists, or even adjacent horizontal lines. It may not show on some listings you work on depending on the formatting of the specific listing and the corresponding HTML for it.
If you have experienced any difficulty with your prior saved listings formatting being different when brought up in the new editor, we would need to look into that on a case by case basis as this would not be a typical experience as a result of this change. In that case, I encourage you to file a support case from under the Help tab of the site letting us know exactly what you have encountered and provide us with the titles of a few listings where you have not yet made adjustments to correct such issues so we can look into it for you.
- Craig