OK, Just ran that and it worked fine within VM. (actually reported an authorisation failure but the detailed reporting made that fixable for me).

I will try this across the network later.

Aborting can be done manually within BoincTaks fairly easily too for those running windows:

With all computers selected:

1. Sort on project name

2. double click on any nested wu's waiting to run

3. highlight any faah wu's (you can use shift and ctrl to speed this up)

4. right click and select abort

5. The frequency that this needs doing will be once every 1 day less than the size in days of your min cache.