ftn95 handling of IO units?

Does FTN95 handle IO units in some unusual way? I'm testing the compiler by attempting to port over some code written using Sun's f95, and I'm getting a result that doesn't make sense to me. Specifically, I have an IO unit open for writing to an output file:

    open(unit=iounit2,file=tracename,status='unknown')
    write (*,*) 'Output file opened'

and then when I write to standard output further down in the code, it ends up in my output file instead. Am I doing something subtly wrong?

The value of iounit2 must not be 2 or 6. For simplicity user values for IO units should be greater than 6.

Aha, that'd be why. Reserved unit numbers seem to be compiler-dependent. Thanks!