Since you have Macs, you may want to look at
Max5 previously called Max/Msp/Jitter
For Windows,
vvvv is an alternative.
Sorry, don't have experience with either - too deep for this old brain.
Then too, if you have reliability problems using Watchout due likely to hardware issues rather than Watchout as you said, you'll probably have similar issues regardless of which software you switch to. Best to sort out your hardware issues first 'cos WO is pretty reliable from many other users' opinions. In fact from what I've heard, reliability was and still is Dataton's first priority in any released versions of WO.
