Existing users, 
On my G4DP 1.25 running 10.4.4 Onyx 1.6.7 toolbar is invisible and renders 1.6.7 not useable.
Hide and Show toolbar does nothing to show the toolbar.
I think maybe 1.6.7 did run under 10.4.3, can't remember.
To reinstall 1.6.5 which does work, you must go to the /Library/Receipts/ and delete OnyX.pkg and delete Onyx app, then you can install 1.6.5.
OnyX
Maintenance, optimization and system personalization tool.
Version: 2.1.1
Invisible Toolbar
Feedback Type: Troubleshooting Report
Contributed by: cprn4fun Wednesday, February 01 2006 @ 01:28 PM PST
Product Platform: MacOSX
Used Product For: Over One Year
Recommend Product: YES
System Info:
Invisible Toolbar - webmason
I have the exact same problem. OS 10.4.4 G4 Dual 1.25 GhzReply to This
Monday, February 13 2006 @ 09:25 AM PST