Strange smell after bottling

[BillZ]

I opened my first bottle of cab from a 2010 vintage I bottled a month ago. When At the time of bottling it did not have any strange smells or tastes. The first thing I noticed last night was a unpleasant vegetable smell. Does anyone know what could of happened?

Thanks

 

[robie]

Does it have a vegetative taste?

If so, it is likely Methoxy pyrazine.

 

[BillZ]

The flavor was slightly altered but not bad. I am thinking it is re-fermenting in the bottle. Either it didn't complete MLF or when I blended the 3 carboys of cab the bugs started eating again. Do I decant, test and try to get it to complete? It was pretty good when it went into the bottle.