The Donations Levels chart, which appears if you click on the Donations tab in the main tool bar, used to show quite a few things that it no longer shows. One of them was maximum signature length or limit versus donation status or level. As I recall, the limit was on the number of lines that you were allowed, not the number of characters or number of KB or etc. However, the implication was that if what you entered exceeded the limits, you wouldn't be allowed to save it. Not that you could save it but always got an error message. That is strange. Also strange is that the limits are apparently still in effect but no longer on the chart.