Chuck:
Aborting the task will cause the exception you describe to get thrown in any other threads that may be working with the task while the task was aborted. So, when you're using asynchronous I/O, this exception may get thrown in the callback thread if the main thread calls abort. The exception should not be thrown from the abort operation itself in the main thread. If that's the case in your application, could you please attach a sample program that demonstrates this?
I'm attaching a small program I've written that uses a slow analog acquisition and uses Abort in the way you describe.
-- Chris
