I am using ESS 7.0.302.26 on a Windows 7 machine. I've just noticed the HIPS log file has grown to almost 7GB and growing. Yes, the "Log all blocked operations" option was set.
If I try to display the HIPS log, ESS has a long think about it, and then displays nothing. I can't find any option to delete or reset this file, and the "Optimize (log files) now" process doesn't achieve anything in this regard.
In hindsight, probably having the log all block operations selected permanently has led to this situation, but I prefer to be able to check the details of protection operations.