Are these files shown in the Access Statistics > Others report? If they are shown here, they should be also shown in the tracked file list. If they aren't shown here, probably the requests for the files are either missing from the logs or have error status - you should check the Errors report to check if the files are listed here.
In any case you can send us a sample log from your site at support@weblogexpert.com and we'll check what could cause the problem.
In any case you can send us a sample log from your site at support@weblogexpert.com and we'll check what could cause the problem.