@memology  Interesting. I didn't know there was a limit to the number of items which could be added to a Watch List - I know the maximum you can specify is 100 items but I thought anything over that went onto 'Page 2'; that certainly happens if you have the display count set to 50 but have more than that in your Watch List.

I experienced something similar to you not so long ago, when clicking on "Add to Watchlist" had no effect whatsoever - the heart didn't go black. I logged out of eBay, logged back in and it worked correctly. I just put it down to "It's not me, it's eBay". Have you tried that?

The only other thing I can think it might be - and with apologies if this is teaching you to suck eggs - is that you're adding something to the Watchlist then going back to check your Watchlist using the back button. If you do that you need to refresh the screen, otherwise anything you've added won't show in the list.

There is no way to get in touch with eBay's coders/developers directly - we're too insignificant to be allowed to contact them (and in any case if direct contact was allowed they would be inundated with reports about faults. They have enough to do creating their own faults let alone fixing the ones they've previously created...).

The best you can do is try going through the Community Team - dave@ebay  marco@ebay  or kat@ebay  - and hope they pass it on to the right team to investigate, though if there is a fault it may (or may not) be fixed at some point in the future and you will never be informed if any action is taken.

Then again this is eBay, so whatever problem you're having today may well not appear tomorrow and you'll start to question whether it actually happened or whether you dreamt it...