Yomgui,

In Draw method Intuition may have locked layers and anything causing drawing operations to other windows can cause a freeze. I havent done low level Intuition coding for ages but IIRC it depends on windows refresh mode.

Edit: for the same reason you must suppress DOS requester if you are using disk I/O from Draw method for some strange reason. It can cause deadlock if DOS is trying to open requester but requester is waiting for Intuition which is waiting in your Draw method for DOS...

[ Edited by itix 21.07.2011 - 14:14 ]