Interesting thread. I have been experiencing the same head scratching issue with PoPo for several years now with an A2000, Blizzard2060 and Deneb. I had moved the Poseidon USB stack to the Deneb ROM and I have been receiving the same PoPo insufficient stack messages at boot-up. Seeing this thread, I installed StackAttack and it has now resolved the issue. Thank you. I checked the stack size for the PoPo task after boot-up and it is now 65k.
Here is what I have inserted right at the top of my startup-sequence, as it may help:
PsdLoadModule DEVS:Input.device QUIET ;first line of startup-sequence
C:SetPatch NOROMUPDATE QUIET
C:StackAttack AUTO
