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I used sudo hdiutil create -o InstallMedia -size 20G -layout SPUD -fs HFS+J -type SPARSE sudo hdiutil attach InstallMedia.sparseimage...
I am experiencing the same issue after multiple attempts at installing it from a fresh dmg image. Was yours a fresh install or an upgrade?
Do we have an ETA for when this issue will be fixed in PD6? I was late into the upgrade cycle in buying PD6 but not late enough to have been...