4-OH MIPT bad batch?

[UberDouche]

Sorry if this has been covered elsewhere, but SWIM aquired a quantity of 4-OH MIPT in January of 2007 from a reputable supplier. SWIM has used this material before that date, and is familiar with it. The supplier in question has previously been %100 reliable (over a one year period).

SWIM has gotten this material from this supplier before with no issues. However, the Jan 07 batch seems to be about 15% potency compared to the last batch from said supplier.
SWIM is not asking for names of sources or anything like that, but would like to know if anyone is aware of this sort of an issue having occured in the recent past?

Thanks, says SWIM.