We need more details. What exact warning do you mean? Why is it always popping up?
Ive attached a screenshot of the dialog.
This dialog gets suppressed during DR as a service, but it means the render doesnt start (i guess because you cant click ok)
If you run DR as the executable, this will appear and halt scene parsing until you click OK. This happens with every render using hair and fur, every time.
If you cancel your render before youve clicked OK, and then click OK, DR is stuck 'waiting for render start' and wont take another job until you close and reopen DR.
I guess it appears because it believes my computer is going to s**t itself when trying to scatter H&F but that might have been the case in like 2009 or whenever H&F was last updated. Today im dealing with a sub 1000 poly object that causes this error so its nothing to worry about.