When you export a file to PDF for prepress the CYMK values do not stay correct. Try a spot color and check values in Corel, export to PDF prepress. Open in Photoshop or Paint and check values. They are no longer correct!! This works fine in X4 and makes X5 pretty useless for commercial printing.
I tried lots of stuff and gave up. Upgrade is cheap and X4 now old news anyway. All worked fine again with 5, 6 and 7.
When looking at the available options to upgrade, i find offers for X6 that in parentheses state it is the "old version" without any other explaination why that was mentioned. Could someone explain if this is a big deal or a mute point ?
X6 still works, but does not have the newest features. It will still do most things your want.
But make sure it is X6 (a couple of years old) and not 6 (which is from 1995). Also make sure it is not Home and Student, which has limitations.