With the constant push of new software versions it's easy to think that everyone is using the latest version of Pro Tools, but you'll often find that some people are using an older version, taking the approach 'if it's not broke then don't mend it.'
Some professionals are reluctant to upgrade to newer versions opting for a version that is working reliably and continuing to pay the bills.
So what about you, what version of Pro Tools are you using? Of course use the comments if you wish to let other people know why.