You can find the Publisher Tasklogs in:
or for Win2003, C:\Documents and Settings\All Users\Application Data\QlikTech\Publisher\Qlikview Distribution Service\1\Log.
You should also be able to see the Tasklog in the QEMC by selecting the task in the Task view, click "Show Task Details" in upper right and then click "Log" tab.
Another place to look for clues is the windows event log on the reloading server. It may be that the driver is presenting a dialog box. In this case, the diaglog message will appear in the Windows Event Application log.