Hey Rod,
I had (past tense) the same problem.
Per jjjnettie's words in the following thread ...
http://www.iceinspace.com.au/forum/s...ad.php?t=94546
You need to download Deep Sky Stacker 3.3.3 beta 47 and all your wildest dreams will come true.
http://tech.groups.yahoo.com/group/DeepSkyStacker/