A continuing memory loss during execution can be caused by failure to keep
up with voluminous IDCMP messages such as MOUSEMOVE messages. Intuition
cannot re-use IDCMP message blocks until you ReplyMsg() them.  If your
window's allotted message blocks are all in use, new sets will be
allocated and not freed till the window is closed.  Continuing memory
losses can also be caused by a program loop containing an allocation-type
call without a corresponding free.