Which logs are you not getting? You mean you don't get log from the SAS session that was scheduled to start? What do you see in the server logs, do they show that the job started successfully? Certainly if the SAS job didn't even start, you won't get a log.
Other than that, I've always gotten a log (but then I use PROC PRINTTO in my code to write my log files).
Is there a reason you posted this message in the SAS Studio forum? If not, I wast thinking I could move it to Administration as I'm guessing that might be a better fit.