Sorry for your trouble. I have a Pro2000 and I like the APS. As NC Cruffler indicates, you need to make sure all the primers are pushed in far enough. Also, running a soft brush through the strip feed channel and/or blowing it out can help. I never have had to lube mine but it doesn't seem like it would hurt anything if you use a dry sort of lube.
One thing I figured out was that when you put the strip in to begin with, push it in until it clicks once and then pull it back so it makes positive contact with the feed mechanism. Don't pull it all the way out (you would break the strip), just pull till it bottoms out and then you're good.
Also, I adjust the stop on the bottom of the shellplate holder so that on the priming stroke the primer bottoms out before the stop touches the frame. I don't have any misfires now. Turns out it takes a lot of pressure to crush a primer. More than I usually exert, at least.
Definitely call RCBS if you can't get it to work right.
-cls
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