Throttle still active on modules

First time throttle got active. It's drupal version 4.6.6. Fine, worked as expected. But ...

Only throttled blocks came back on the screen. Modules were still off and kept off. No module that was marked as to be throttled came back online through the system. Just turning off throttle (Zero Zero) made the things come back.

Is that a feature, that modules are still off an hour after the throttle event. Or is it an error? Of course, user counts are back normal.

Ralf