There seems some problems with EAC v0.6beta on some systems. There was one report of extracting too slow (possibly only Plextor 32TSI) and one report of not ripping of second or third drives. Only the first drive was used for extraction even if another one was selected…
If you also think you have found a bug, please test it also with older versions (like 0.5beta and 0.4beta). If both are not working, it is an old bug not found yet, otherwise it is one that is new in 0.6beta (What is interesting for me to know…)