Acurcl generates "runcbl.99999999.log" files when acuthin connects

Acurcl genarates 'runcbl.*.log files every time some of our users connect.  The information in these files is:

Initiate contact with client

Client respons: 2

Client is AcuThin

Client is using protocol 26

Client is using trace level 0

Connect to the remote ASG

Does anyone know what causes these files to be generated (and how I can turn them off)?