Hi Beth – If I’m not mistaken, Cloverleaf 5.3 and below are not supported on AIX 5.3. Likewise, I don’t believe that Cloverleaf 5.5 will run on an AIX level below 5.2.
We’re currently planning an upgrade this summer from our Cloverleaf 5.3 software running on AIX 5.1 to Cloverleaf 5.5.1 on AIX 5.3.
(Fortunately, we needed new hardware, so our migration to the new version of Cloverleaf and AIX will be on this new machine, simplifying the upgrade.)
– Glenn