I don't have a problem, this is really a request for enlightenment.

When I publish as a pdf the menu against compatibility lists acrobat 4, 5, 6, PDF/X-1, PDF/X-1a, and shows 5 by default.
If I convert using 4, 5, or 6 I get logos, clipart etc as negatives. /X-1 and /X1-a work ok. But it used to convert ok using the default one shown, v5. I have reader v8 on my machine.
Is the above 'normal' behaviour, i.e. v4,5 and 6 don't work?
Can I set the drop down box to show PDF/X-1 by default on start-up?
Can PDF/X-1 be read by any version of acrobat reader?
Does Acrobat v9 work with PPX3?
I'm running Vista 32bit - but I don't think this is an issue.