This is something I've noticed off and on for a few months, assuming it was random (e.g. a deadlock) but it seems to be reproducible - hopefully I can describe it so you might be able to write a test and track down the source, if it does what it seems to..
- pick a page which is already saved by others, e.g. from the popular page - save it and add a few tags - check that we appear in the "saved by nn other people" list - then edit it to add a few more tags (e.g. have read the bookmarked article again and found more about it) - then add a few more tags... After somewhere around 200/210/220 characters worth of tags are added we disappear from the "saved by nn other people list". What's a little odd is that it's still in our bookmark list, and all the tags are still there, and we can add still more tags (beyond ~200 chars) and it saves them fine (suggesting the tag-field is not limited by character size) - but we never again appear amongst those who've saved the tags, even if we lower the number of tags. Does that make sense? I only did one test of this hunch. Does it sound like it could be added to the unit tests to confirm it as a bug? I don't know if it's possible to run a query to find such pages, there are a few pages in my own list, so presumably others would be affected. It's no show-stopper, just confusing and a little weird.
