I have been using WLP007 to brew my IPAs for a couple of years now with mostly good results. Attenuation und flocculation are great. Only problem I had been having is was way too many esters, but I got this pretty much under control by keeping a consistently low fermentation temp (17°C). Now that I get a nice fairly clean beer right after fermentation, I have been able to better tell how the beer develops during the bottle conditioning and storage. What I have noticed in both of my last two brews was an odd aroma / flavor that developed 2-3 weeks after bottling and diminished again about 6 weeks after bottling. I can't really pinpoint the flavor, I isn't fruity estery though (that aroma I definitely know from warm fermentation). I would describe it as a bit more grassy or veggy...I guess. Definitely not a "fresh" flavor, a bit "funky", if you will... The bottles are stored at a fairly constant temperature, but not nearly as cold as during fermentation, closer to 19-20°C. Not sure if that has anything to do with it. Does anyone have any idea of what might be going on?