It seems that after installing the updates released during the last month or two, the “wuauclt.exe /resetauthorization /detectnow” command no longer starts a detect cycle on the clients here. However, running “wuauclt.exe /detectnow” (without the /resetauthorization parameter) works fine.
Since this is a huge loss of functionality, could you add a new command to run wuauclt.exe /detectnow?