I downloaded version 1.10.143 last night, installed it today and just finished taking it for a pretty comprehensive spin just a few moments ago. My C drive is 40 GB, secondary drive (F) is 200 GB, and I have a .5 TB external drive (G) with firewire for my backup files and drive images.
I ran the following on all the drives: analyze, defrag, defrag free space, and then a final check drive for errors. G went fine and so did F, but when I got the C drive all defragged and whipped into shape, I clicked on "check drive for errors: and it stopped at 100% (stage 2) and said it was unable to verify drive and asked if I would like to run CHKDSK\F to fix the errors.
I declined and decided to run it again -- that time it went through all 3 phases just fine and declared that there were no major errors. I'm not particularly worried but just curious about the discrepancy...?