Finished my port of enblend version 4.0 today in time to use it for today's panorama processing. Surprise, surprise: no particular problems. In one case I got a crash:
enblend: info: remove invalid output image "00-05.tif"
gmake: *** [00-05.tif] Error 1
This was the house-e image, where I had accidentally taken two identical photos. That's always been a problem, and the error message tells you what to do. But it's still surprising. I suppose I should look at the algorithm to find out why.