File Events remain in CHECKING state after logging changes, because the Next Check of the File Event is in the past. There is no error message in the logfiles or reports.
See screenshot below:
File events remained in "checking" state after logging changes and the event check gets an error.
Update to a fix version listed below or a newer version if available.
Fix Status: In Progress
Automation Engine 12.2.0 - Planned release date: 2018-06-19
Automation Engine 12.1.1 - Available
Automation Engine 12.0.5 - Available
Automation Engine 11.2.7 - Available