Thanks Kirk, i guess i've found something interesting, although quite alarming: i performed various searches inside different folders containing jpg files only, which have only been exported by Lightroom... and all went ok.... but then i've found out that when any photo is processed by Photoshop and save by it... the creation date becomes the very moment in which the file is saved on disk... :-(((
I searched in the PS and Finder preferences to see if there's any option i could check/uncheck, but found nothing...
Any thoughts or suggestions?
P.S. even stranger behavior: when i open in PM any folder (even those for which the date search doesn't work) how is it possible that PM actually can correctly sort all file by actual capture time...?!?