All questions related to installations, configurations and maintenance of Advanced Host Monitor (including additional tools such as RMA for Windows, RMA Manager, Web Servie, RCC).
What kind of log file do you use? DBF?
There is undocumented option, you may add DBFReplySize=30 line into hostmon.ini file (Misc section), remove old log file and restart HostMonitor (30 is just for example, you may specify different size for the field)