bug on Russian servers at least (that's - in reverse translation to Engish, "слишком быстрая операция" - in Russian) . Even when there are no quick repetitive operations in sight (sometimes - immediately after login). Very cumbersome and bothering.. There is another error message that bothers sometimes: "Entrance error. Reload the page" (in Russian: "Ошибка входа - перезагрузите страницу"), but the first one is more frequent and annoys a lot.