PsTools : psexec with autorunsc output file empty

Is this running local or remote? On a domain?

I have found in searches about output files that versions do tend to give various results. The syntax in your example is correct, as far as I can tell. I even duplicated it with my own unique local and remote settings and returned an output.log file with data every time. 

If this is on a domain, you might need to enter the fully qualified D.N.

I hope any of this helps. Or perhaps you have solved it already.