Strange Behavior on Long Delay Compensation

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I have an HD3 with a core card, an Accel card and a process card. I have a session which takes up all the slots on the core card, all the slots on the accel and a couple of slots on the process card when the playback engine is 2 DSPs and 48 voices at short delay compensation.

When I switch to Long Delay compensation, the system leaves the last 4-6 slots (depending on if I change the DSP/Voice count) on the process card unused and reports insufficient DSP (Error 7077) to load the last 5 or so plugs. I can see that I have 4-6 DSP chips left. Why is the system telling me that I have none and refusing to load these last plugs.

Any help is appreciated.

John