it has been mentioned on the QB many times about precuts having pinked edges... do you use the innie or the outie to measure your 1/4" seam. in the case of cutting your own pieces with the rotary cutter, it would be the innie to measure your seam from since that is the edge of the blade against the ruler. not only be careful of the other cautions mentioned, but note that the cutter can damage the edge of your ruler. although it would be twice the work, i'd opt to cut with a straight blade and use the pinking blade later. you also might consider making your cut pieces bigger and sew a bigger seam allowance so that the pinking does not leave you with a very narrow seam allowance.