Hi Peter
The delta load from DSO will always use change log table. Only when you do initialization, you have the option of using active table but then always change log is used.
If the debug didn't start, it doesn't mean that the data is already loaded. If the data is loaded, it will show No more data available.
Please create a full dtp and give some selections like material number or request id. Try this way, it should work.
Hope this helps
Regards
Karthik