There are two possibilities to solve this situation:
Option 1: Kill the existing kt_daemon process using the task manager, the process should restart automatically and the stdlog should record a message like the following if successful:
kt_daemon 9152 SIGNIFICANT KTDaemon.c 1259 KT daemon ready for action!
Once the record is in the stdlog the attachments should work properly.
Option 2: Restart the Service Desk service.