In certain cases the expand=X parameter is not reset when it should. For example, when removing all files of an anime by clicking all the files' checkboxes (I know, doing that is a stupid thing) or browsing to a different page with the jump-to letters or using one of the hide/show filters that would hide the expanded anime from view.
In short, when the user does something that makes the expanded anime not show up in the display, the expand= should be reset or ignored.
[CGI] minor mylist quirks [trackered]
Moderator: AniDB
Well, yes. 
If an anime is expanded but doesn't appear, there's no control button to un-expand it and the checkboxes for animes as well as the dropdown control at the bottom of the page are gone. It's a minor disruption in the user interface, so nothing important - but I thought I'd report it nevertheless. 
If an anime is expanded but doesn't appear, there's no control button to un-expand it and the checkboxes for animes as well as the dropdown control at the bottom of the page are gone. It's a minor disruption in the user interface, so nothing important - but I thought I'd report it nevertheless. I recently came across this bug and was puzzled by it.
What happened was I had an anime expanded, then I clicked the next button. Then I tried to click on the check-boxes to update another anime, but I couldn't find the check boxes. I tried to refresh thinking it was a loading problem, but that didn't help.
I would propose that clicking on any of the filters, the letters or prev/next would reset the expand=xxx setting.
This would still leave the challenge of the user making a change to the anime that makes it filtered out (i.e. marking all as read if hide viewed is on) or deleting all the episodes. But this is a rarer case and the user would probably realize that they caused the anime to disappear by their actions.
What happened was I had an anime expanded, then I clicked the next button. Then I tried to click on the check-boxes to update another anime, but I couldn't find the check boxes. I tried to refresh thinking it was a loading problem, but that didn't help.
I would propose that clicking on any of the filters, the letters or prev/next would reset the expand=xxx setting.
This would still leave the challenge of the user making a change to the anime that makes it filtered out (i.e. marking all as read if hide viewed is on) or deleting all the episodes. But this is a rarer case and the user would probably realize that they caused the anime to disappear by their actions.