rharton wroteUsing Beta 4 and trying to use the disk defragmenter.. It will appear like it is working, then will show 100% complete but appears to still be working, and never completes... I might add that it shows 100% after just a couple of moments...
This issue should be fixed in Beta5. The Beta4's Disk Defragmenter had a few bugs that could cause it to hang or crash the application.
But I would like to point out that testing the Disk Defragmenter should be absolutely safe, it doesn't use any low-level operations so data loss or corruption is in theory impossible.