I had the same type of outcome on one batch. I have used it twice.
The first time was on a BDSA, and I left it in the 2ndary for a couple months before bottling. This batch doesn't have any of that bready/yeasty aroma and is developing more and more of the dark fruit flavors I was hoping for as it has aged.
Then I pitched a Dubbel on part of the yeast cake from that batch. This one came out tasting great. I left it in primary for maybe 3 weeks or so (don't have my notes with me atm). But as I have gone through the batch, that yeasty aroma has increased.
I figured I had just over-pitched by pitching on the yeast cake, even though I had dumped out a good bunch of it. Maybe it just needed more time. I'm not sure.
Primary/Secondary - NB SMaSH kit with added specialty malts and hops (Ain't no SMaSH no more), Norther Brewer's Oud Bruin de Table / nada
Kegged - nada
Bottled - Back To School Porter, an Imperial Robust Porter with vanilla beans added; Signpost Edge the Belgique