Supposedly someone has been working on this for months but I would like to know who else is having this problem. Please see screenshot below.
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You could try using another browser.
Fails for me in Firefox 31.0 (old, obsolete version) which I use for most listing - box is there with non-spinning circle, but did work fine last time I checked in Firefox 52.2.1ESR (semi obsolete version).
Is failing in FF52 now. I see this:
Wheel of death spins forever. "Add or Edit list" and "Use My Vehicles" both pop up a white modal dialog with nothing but a spinning wheel of death and go nowhere. "Use VIN" however works fine (but is mostly useless for listing a part unless only one vehicle is to be added or one has multiple VINs on hand).
However, that is with my default browser settings blocking script for ajax.googleapis.com If I allow scripts form that domain, I see the same thing you did that shows in your screenshot - nothing where the compatibility stuff should be.
Appears eBay is using jquery code pulled from googleapis for the compatibility code (which is %&^#* lazy and stupid - I block everything NOT ebay when on ebay.com)
If you happen to be using NoScript (or similar extension) in your browser you might try temp blocking scripts from ajax.googleapis.com and see if anything changes. Or using Adblock Plus and block it with something like
ajax.googleapis.com^$domain=ebay.com
(It most likely won't work but curious if you get the same results I did)
No fixes here just observations. Compatibility appears to be totally broken now. I can no longer switch to Firefox 52 to create/revise listings and have compatibility work, and have no other options. No more Motors listings for me I guess.
@berserkerplanet wrote:
Ok, I found a workaround (again - I did the legwork again, totally had forgotten about the previous occurrence of this, found the other thread, and doh!)
Spoof the browser user agent to indicate that it's an iPad or IE9 AND block ajax.googleapis.com content and it all works.
It was laid out in the other thread your surfaced:https://community.ebay.com/t5/Technical-Issues/ebay-motors-edit-or-add-compatibility-list-not-workin...
(things have changed since then: IE7 is now totally rejected as a browser ID, but IE9 and iPad Safari 6 still work, and blocking of ajax.googleapis.com content is required)
Block ajax.googleapis.com and figure out how to spoof the user agent (manually in about:config, using an addon if there is one for your browser, run an older portable Firefox where you can use the addon, etc) or run an older browser like IE9 if you can (virtual machine?).
It takes me literally 5 seconds to run around: click User Agent Switcher icon in browser toolbar, choose iPad Safari 6.0 from dropdown, hit F5 to reload listing revise page, and compatibility is there and functioning (I do so little Motors listing, or Motors listing that requires compatibility that it is not a burden - if I remember the workaround 🙂
It totally works, but there is no easy button answer to implementing it if you are running the latest and greatest browsers that prevent user control in the name of security and browser dumbing down - Firefox is no longer a power user's tool.
(I have the ajax.googleapis.com content blocked by default in those browsers via an Adblock Plus rule and a Noscript rule. Can also be temporarily implemented using a Windows HOSTS file entry 0.0.0.0 ajax.googleapis.com for testing)
In the other thread you mentioned using an older version of Firefox for a Zebra printer - if it's Firefox 31 or newer, it works with the listing form, and you can use XPI addons like User Agent Switcher in it (older versions like 21 or 11 might work also, but the way I have them set up I can't test it easily)
brian@ebay This eBay Motors compatibility bug is still a major issue. The compatibility section is either blank or partially displayed and non-functional with a spinning wheel of death in Firefox 31-52 for me, and in other newer various brand browsers for other users.
For me, if the browser user agent is spoofed as an iPad, or IE9, AND block the jQuery call to ajax.googleapis.com it works in both FF31 and FF52. That indicates it is falling back to older simpler code that works, and that the new code is broken (which would affect most users running current browser versions) See the link to the other thread a couple of paragraphs above.
I do see that this is still an open issue that our developers are looking into. I'll pass along the details you've shared in this thread for them to review. Thanks, @berserkerplanet!
@bestdealinparts wrote:
Hi @bestdealinparts, no updates yet. I'll bring this up with the tech team this week to see if there is any new information to share.
@street-motto-cycles I was doing the same thing, changing the compatibility after listing, but of course I was so unlucky that I had one item sell before getting the chance to make the changes 
This worked sporadically, like once in 3, 4 tries. Then this morning I found your suggestion, with changing the category, but every time I would update the compatibility chart it would either reverse to the old one or it would give me some error and a text written in red saying to try again later.
So tonight I tried again changing the category to try to bring up the compatibility chart, with a listing I was creating, BEFORE I would hit the "list" button, and it worked... for now.
But I'm so mad! 😞
