Originally Posted by BetterRed
@theducks, you are not alone - I thought it was just me, your post prompted me to go snooping
I downloaded Calibre 0.97 at 2012-11-24 13:15:38 and installed a few minutes later (as I always do)
The Modify date on the subfolders of C:\Program Files (x86)\Calibre2 lie between 2012-11-24 13:20:24 and 13:20:46
3852 books in my main library have Modify time-stamp of 2012-11-24 13:21:35, 7 books have Modified timestamps that are later - these are the books I've added/modified since Saturday.
The Modify date on the opf files in 1,665 book folders lie between 2012-11-24 13:21:40 and 13:24:48 - some of the books are members of series others are not.
I am 99.99999999'% sure I did not do a bulk operation on my entire library (or any substantial part of it) immediately after I installed 0.97 on Saturday afternoon.
766 is less than 20% of my Library.
Of the books affected: some have 2009,2010,2011,2012 (record) creation dates. (as I said...No obvious pattern