I have a few mega torches around my base and after bringing a vanilla blaze spawner back from the nether and placing into a mob trap in my base, nothing will spawn.

Resturbed Spawners from EU2 are also blocked.

please keep in mind that the 1.5 update for torchmaster had some major changes to the torch logic. If anyone updates from 1.4 to 1.5, they will need to break+replace all torches/lamps.

Breaking them and replacing them all seemed to fix it...