I see! Thanks Philippe. I was wondering if perhaps there was some error (due to a windows update) that was preventing Wavelab ‘seeing’ the 4 virtual cores but I understand now the reasoning for the change in programming.
 By the way I was wondering why are there the written options in batch processing for “Usage of processing cores” (i.e. All cores, Half of the cores but two, etc) and not just the ability to choose the number of tasks? Is it not the same thing? On my 4 core PC I have the option to choose between 1 - 4 tasks but also:
Half of the cores = 2 = 2 tasks
Half of the cores but two = 2-2 = 0 tasks! However I tested this and it does just run 1 task.
Half of the cores but one = 2-1 = 1 task
All cores but 2 = 4-2 = 2 tasks
All cores but 1 = 4-1 = 3 tasks