My preferred "short date format" (yyyy MMM d) causes garbled text in the Modified column. Replacing the spaces with hyphens (yyyy-MMM-d) is not garbled.
Try 10.0.0.1, which includes a fix for that (or something very similar):
I'm experiencing a similar issue with Opus 10.0.0.0, except it only seems to affect the metadata dates for images. I tried 10.0.0.1 in a VM and got similar a similar result (Windows 7 x64 again, screenshot is 10.0.0.0):
10.0.0.1 Fixed my issue.
HurklingStone, thanks for reporting that.
The camera date-time columns didn't respect the setting that tells them not to display seconds in the time, which in turn meant there wasn't enough space in the column and the date/time parts overlap.
Jon has written a fix which will be in 10.0.0.2.