Why does the render engine sometimes spontaneously switch from Iray to 3DLight?

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Okay, this is a wierd one I've noticed happen occasionally.  Why does the render engine sometimes spontaneously switch from Iray to 3DLight?

I've noticed on rare occasions where, apparently after I load some ancient set or prop or something into a scene, then go to save the whole scene out (which I usually do from the Render tab), or go to render the scene, or whatever...  suddenly I notice that my render engine has been switched from Iray over to 3DLight.  I just had that happen to me a few moments ago,  Of couse, I promptly switched the render engine back to Iray again...  but... what the everlovin'..... heck might trigger it to change something like that?  :D

Anyone know?

 

Sevrin

Some scenes come with render settings for 3DL?  I don't use older sets much so I haven't had this happen.

fastbike1

Never seen this happen.

nomad-ads_8ecd56922e

I think one time it did something like that when I simply loaded a prop.

FSMCDesigns

fastbike1 said:

Never seen this happen.

same here.