Mipmaps and LODs not switching in 4.9

hello:)
i haven’t been using UE for very long, a few months at the most. i have recently come across a couple of issues since upgrading a project to 4.9.

I have a scene with 2 meshes, both have 3 LODs.
when i open the Statistics panel, no matter what distance i view my scene, the memory used doesn’t change hardly at all and neither do the ‘current dimensions’ for most of my textures.
I have compared the mipmap settings (level of detail, compression, texture) of one of the textures that seems to be working vs one that isn’t, and the settings are the same.
then if i zoom in and out a bit in my scene, the textures that were working (could see the mipmaps switching in statistics panel) become static at max resolution like the rest:s

i have also noticed that my LOD’s don’t appear to be switching in the viewport any more, but when i look at them in the mesh editor, i can see the LODs switching in there

i have attached a screenie of my scene at a distance with the statistic panel open and refreshed. and one of the texture settings.

any help or guidance would be greatly appreciated:)
thanks,

![alt text][1]


I just moved our project to 4.9 and have had the same problem with LODS.
Anyone know what’s up with this?