V-Ray Path Sampler Locked

Anyone ever have this happen to them? It looks like the path sampler option is locked for some reason. I don’t know when it happened or what i was doing that caused it. I was checking my settings and noticed it and thought it was strange. I have never seen this before. Anyone know what is going on?

V-Ray 1.5.00 on R8

The Schlick sampler is the only path sampler that will be supported from SP1 onward.

Best regards,
Vlado

Thanks for the info. Always appreciated vlado