Having done contract flying myself for several years now, I can see what metroman is talking about, however.....
I did not start to fly as a contracter at free will, I just did not have a choice at the time...the only jobs available then after I was layed off by a bankrupt company was a contract pilot for 6 months.
Now I must say the money was good, but the insecurity a bitt less.
Companies use you often for the summer season only, or until they upgrade some co-pilots, so being stopped a contract is not my fault , just a commercial decision.
I accept that but I also realize that it can be seen by a prospective employer as a higly unreliable pilot, who can't stay anywhere longer than 6 months to a year.
Having started to look for a "fixed" job myself, in return for less cash, but more security, I have started to worry about this as well.
I can only hope that my explanation will go well with the interviewer as I have always wanted the secure job, just could not find it so far.