Application logs are available in the tab Logs :
They contain the history of run jobs and useful messages upon failure.
Buffer refresh settings
Since Alpana v3.2, it is no longer necessary to set the Connection with Buffer refresh settings to see th change when a file is updated.
I/O Errors and file permissions
The Windows Service must have access to the source files.
By default, the Service is run by a Local System user.
Check if this user has correct permissions, or change what Windows account is used to run the Service :