Are you using the Birchwood Casey Tru-Oil product?
I've never experienced that, and have applied Tru-oil, Tung oil and lacquer on after staining various woods with the oil-based Minwax stains. One thing I can tell you for sure is that the stain can take a LONG time to dry especially if applied heavily. It can feel completely dry to the touch, but isn't, had a couple of resand jobs due to applying lacquer when the stain wasn't really completely dry and had subsequent issues with the lacquer not adhering properly and clouding in places. If you think it's dry, always wait an extra week to be sure....
Another tip with the Tru-oil is to apply the coats as thinly as humanly possible. I usually wipe each coat down with the rag I use to apply it with about a minute after applying to make sure it's uniform and there's no excess anywhere. You wind up having to apply a lot more coats but in the end it's worth it.
Here's a DIY finishing thread and the finished L5S I did last year using the stains and Tru-oil; wound up taking about 6-7 weeks to do the finish.
http://www.unofficialwarmoth.com/index.php?topic=1946.0