The rawdata in the 'new' file created after the rename has the correct date and time. If this is the data you get from the PABX then you should have no issues.
I think at some point in the past the date-time was in the future. On the TNG Call List page this will only be noticed day by day as it only displays the last 50 entries for today and yesterday.
Best option will be to blank the database and re-import the raw.txt files, but before importing the raw.txt files make sure that the date-time is correct. There is no easy way to do this. You will need to check office hours against the time calls logged in the raw.txt.
Other option is to blank the call details and log calls from here on. If you pull a report for after tomorrow and it has call details, then there are still data in the future being sent off. You can setup a scheduled report to keep track of this.
To ensure calls are logged during office hours you can setup the alert notifications - refer to forum post:
TNG Alarm Configuration (TNG v1.0.6.5 or newer)If the time is in the future, it will help show early in the morning that you have no calls.
I will setup TNG on another PC and run more test and get back to you.