Did Montblanc reformulate it's Permanent Blue ink this year? The first bottle purchased in 2014 performed flawlessly in my MB-146 and Waterman Kultur. Each pen start writing immediately regardless if left unused for a day or even several days. My second bottle purchased earlier this year has cause both pens to hard start if left unused for just several hours or more. I've even thoroughly flushed each pen with JB's and water between the last four refills and they still hard start. Getting really frustrating.