For v12.xx and during a reload, log files are kept in a QVB-specific folder and only copied to the correct Distribution Service log folder when the task (somehow) finishes.
During reloads, have a look in: C:\ProgramData\QlikTech\QlikViewBatch
The story appears to be that Qlik reorganised log file generation to get better reload performance.
[Edit] Sorry. Spelling mistakes made my post almost incomprehensible. Corrected (I hope)