OnyX 1.8.x is for OS 10.4, not 10.5. That's probably why you are getting the freeze. Try OnyX 2.0.6, the correct version for your OS. Did you use the install disk for 10.5? If you used a different one, it has the wrong version of Disk Utility for your version.
Jon
macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365
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