DSS has done that to me for about 3 years. Or would tell me out of memory (on a 12GB RAM system at the time - now more - that was rich!). Then it wouldn't stack properly, or not detect any stars (in a shot of M8, not finding stars is like not finding a fat guy at McDonalds).
I gave up on DSS. Yes, it is free, but it is a headache IMHO.
Went to CCDStack. Had VERY few issues. Worth every cent. BLISS.
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