Finder doesn't see USB drive - Another one!

I shall describe the situation:
400GB SATA HDD in triple interface enclosure. Drive partitioned into six volumes.
This drive mounts and runs fine on a brand-new MacMini (OS 10.5), a 3 year old PowerBook (OS 10.4.11), a 7 year old TiBook 667 (OS 10.3.9), and a PowerBook G3 500 'Bronze' (first FireWire, OS 10.2.8).
But on my MacBook Pro, Finder doesn't see it.
Every other program on my MacBookPro that I can run sees this drive: DiskUtility, USB Probe, TechTool, Disk Warrior, all say everything is fine, and the disk IS mounted.
Finder doesn't see it, not on the desktop, not in a Finder window, not in any open/close dialogue boxes.
Doesn't matter how it's connected, USB, FireWire 400 or 800, or which cables are used.
Since Finder can't see it, I have to make sure I go to DiskUtility to unmount them, or I get the Device Removal warning.
Does this sound familiar to anyone? Anyone know which switch got set wrong and how to set it back?

I have several identical 400GB external drives connected via Belkin hubs.
They have worked flawlessly until the latest Security Update.
Now one of them will no longer show up when connected via the hub but will if connected directly. The other identical drives still work ok.
It won't show in Finder or Disk Utility unless connected direct and this is quite reproducible. No problems reading it on a Macbook with Leopard either.
AC

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