Files are left over in tmp directory after apache has been switched off

If i install and run the agent and then switch it off then there are files left in the tmp directory.

e.g.
agent-12845200-1e1f.pipe
agent-6422544-304.pipe
agent-gc-12845200-1d1e.pipe
agent-gc-6422544-203.pipe
monitor.pipe

These should really be deleted after apache is being set up otherwise we may have problems with files being reused.