I'm posting this as a follow up to my 1st posting.

Back home in Maryland we are having an unusually cold spell here so I thought I'd try the same set-up again (same stove, same cannister). Last night was about 10 degrees (Fahrenheit) and I left the stove out for about 3 hours before I fired it up. I put a pot of water on it and checked it every 5 minutes or so for 30 minutes. It worked like a charm, never had to adjust it at all. I left the stove out overnight and fired it up again this morning (5 degrees now). Let it run for another 30 mins and it works great again.

So now I'm trying to figure out what is the difference? Cannister is less full than before but I wouldn't think that would be a big deal. I do remember that on the trip when I put the 1st pot of snow on the stove there was snow on the outside of the pot and when it melted the water dripped onto the stove and put the flame out, but it started right up again with no problem. Maybe this was a one time deal but something did cause a problem.

Anyways, thanks for all the comments and ideas that you provided. This was my first time backpacking in snow and I learned alot from it, and look forward to my next trip!
Mark