A very odd thing happened to me today on the way to the forum! Help!

["Max" oatcruncher]

Hi Folks!
I have tried to sort this out myself, but decided before I went completely =
mad I'd ask the experts. I have a sneaking suspicion that the answer will t=
urn out to be ridiculously simple, but I don't care!
Right, I filled a 4 gig card with a single test recording at 24/48 to see h=
ow much time I'd get on my FR2. I opened up the file in Audition 1.5 and wa=
s perplexed to see a length shown as about forty eight minutes; the sort of=
 length I might expect from a one gig card. I did a check and found that it=
 definitely was a 4 gig card and thought what's going on? I next made a cop=
y of the file and opened it in Audacity, and low and behold it's now showin=
g more or less what I expected; about 3.54.
So, the question is WHY is Audition only apparently loading less than a qua=
rter of the file?
Hopefully yours
Max