You are very welcome.
And yes, I thought the lot of you were doing a chicken little 🙂 I hadn't explored the various calculator issues in detail, and it looks like my Redirector rules were accidentally fixing some of the issues and therefore hiding them from me.
(I have so much eBay page modification going on it's sometimes tough to tell what is going on when someones else says "A does B". Even when I turn off Stylish rules, Adblock Rules, the half dozen eBay page changing GreaseMonkey scripts, maybe allow a few normally blocked eBay scripts to temporarily load in Noscript, maybe disable my 50k+ entry HOSTS file, disable Useragent spoofing for certain eBay pages in UAcontrol, sometimes go in in change general browser JavaScript function blocks in script manager, disable Redirector, bypass my web proxy, and maybe allow some blocked cookies, the fact remains I'm often using Firefox 3.6.24 which is old and obsolete as dirt and can behave differently than newer versions and can't do a lot of things. Then I have to turn everything back on and repeat for Firefox 31. Then do tests in Firefox 52 with no blocking of anything. If I was getting paid for this I'd probably run a couple of browsers specifically set up for this, but...)
That's how I stumbled on the cause of the problem - I temp disabled Redirector and got the "we looked everywhere page" and knew there was something happening I could then figure out. Fired up HTTPfox and the Firefox web-developer tools and traced things out as best I could. Lot of trial and error initially.)
Hopefully eBay will get these things fixed before the end of days. They are integral to buying and selling and buying here, and maybe they can divert some of the deck chair re-arranging crew (managed payments, bollixing search, eBay catalog, Seller Hub) to fixing these basic functions.