probably some invoked macro or %included code includes
option mprint ;
If you only wish to avoid huge log files, then look at the LOGPARM option.
With invocation option -logparm "ROLLOVER=1M" the logfile is opened afresh when it becomes 1 megabyte.
There are other options and values causing log roll over on change of date or time or different log file sizes.
See SAS9.2 documentation of LOGPARM at
http://support.sas.com/documentation/cdl/en/lrdict/62618/HTML/default/a002303556.htm and the links to this option on your platform
and I would really encourage you to reinstate options NOTES and SOURCE, and unless "support" is really unneccessary, MPRINT.
hope it will help
PeterC