About a year ago, I took a FMQ class at my local Bernina dealership. Because 505 isn't sold locally and Dritz is carried by several shops, everyone in the class brought Dritz to class except me (I get 505 from Amazon). Every single Dritz user had the exact same problem with gummed needles.
I'm not sure if it's the glue (never used Dritz) or that the instructions say spray it on the batting. However, because more is needed if used on batting, because it will sink to the center, I would try spraying on the backing and top. Or, just switch to 505 spray (top and backing, not batting) and forget about it altogether.