Black lines at corners + White glow around object

Hello all,

Hope everyone had a great Christmas period and New Year,

So i’ve been working on this project for a little while and its all be going fine, however on baking lights i’ve noticed some dark shadows around the majority of the walls where they meet the roof and on corners. It’s not post process volume adding in AO, its not baking the AO in lightmass, the resolution for these items lightmass is already 3-4x the size it needs to be. I’m at a bit of a loss where they are creeping in from. The mesh itself is also flush with the ceiling so its not shadow bleeding through that way either.

The second issue is the white light around the tv cabinet. Here i’ve got nothing either. The model looks fine inside of 3ds max, it has all the faces it needs so nothing should be bleeding through, their are no hidden lights etc. Its just this, the colour of the glow will change with whatever material is on the cabinet.