Some default linestyle print as hole lines.
Example the linestyle 1.
Any hope for fix to pre V8i users?
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I'm not sure what you mean by "hole line". Could you describe that further or post an example?
The linestyles 1-7 are defined in the .plt or .pltcfg file so can be printed to look like pretty much any dash-dot configuration regardless of how they display on the screen. Check on that.
The pen table can also do some resymbolization, so check to see if that is a factor or just detach it and see if it helps, thus limiting where the problem lies.