Lighting is Broken after Optimisation

[kjoort]

Hi, 

After running the optimisation process the lighting is weird on my trees. Please see the pic for an example of before and after. It happens every time. Is there a lighting stage to the optimisation process?

 

[Bryan]

You may have to check the new object that it combined to make, lighting may not be passing through it due to it being a new object. 
Make sure you have shadow and all that enabled on the combined object as well.