Some problems of Multi/Sub-Object Material with Controllers

[ryanyrchen]

I create a multi/sub-object material with 2 sub materials, and use controllers on the sub materials so that I can make animation on the material. But I find that the animation doesn't work UNLEES I keep the Slate Material Editor open, which is obviously unreasonable. 

Can anyone help with this? Thanks for your help!

[ryanyrchen]

The sub materials are dx shader material with hlsl, and I found that if I use physical material instead of dx shader material, the controller works and if I don't use multi/sub-object material but juse one dx shader material, it works too.

Really strange..