I had three pairings I've bid for in the last two months that ended up in open time. One reason they weren't awarded was because of "seniority," the was "proper rest." Both cases were BS, fortunately I was able to swap them out, again I bid pretty senior and the seniority one? no one was awarded it at all.
My mid month paycheck is consistently short by 25-200 bucks also.
Also, in this latest vacancy award I noticed that there were some people off the equipment lock that weren't allowed to switch airframes. Specifically FOs that wanted to switch MD80 to AB or 757. All the spots went to NHs.