Worse, if I remember right, the page’s entire state (for all the creators) was represented in a single, slow HTTP request that was fired off when any checkbox was changed. Unchecking checkboxes quickly (faster than 1/second) would lead to undefined behaviour as requests get processed out of order and earlier requests would override some of the latter ones, silently undoing your work (since the earlier request has more remaining checkboxes - remember that every request represents the entire state of the page).
Absolutely dumb design on so many levels.