Ferrite core through PCB, how to close?
That ferrite core is being used as the core for a transformer (note the swirly traces). Your adhesive has introduced a very small gap in the core, which will alter its performance and could be the cause of it not working anymore.

Here's some interesting reading on gluing ferrite cores for transformers (they try to go for a 5um to 50um gap in the core introduced by the adhesive): http://elnamagnetics.com/wp-content/uploads/library/elna-magnetics/gluing_of_ferrite_cores.pdf