1080p 60Hz - WDTV says not supported

I have a Mitsubishi WD-_60C9_ and when I choose my resolution is options, it tells me that 1080p 60Hz is not supported when I know it is. It says so in my owners manual. I have to force it to use those options but wondering if doing so causes any issues.

No.  I had to do the same thing after the last update and some videos wouldnt play but after I turned it off and back on again it worked fine.