I use EPP in 4x5 for all my studio product photos. I buy in 50 sheet boxes. I have all fresh in-date film. I process in my own 3.5 gallon sink-line. I mix up fresh chemistry every couple of weeks and do not use to exhaustion. I only replenish the bleach. The last couple of boxes of 4x5 Ektachrome EPP is looking rather magenta, which in the past would indicate somewhat old film...but this film is "in-date" with an expiration date of 03/2010. I order my film from reputable dealers I have used for 20 years or more. Oddly enough, if it were a chemistry problem, 35mm Fuji Provia I have processed a couple of days ago looks great. Could my water quality (I use city water) have changed enough in the last year to affect the color balance of Kodak E-6 chemistry? Affect the color on Kodak films but not Fuji films? It's a puzzling problem.