Try to use it under wine (not Crossover). I have been actually working with WordPerfect 12 using wine (I update it weekly to the newest version) and Kubuntu Gutsy for more than a month now. No problems, it just words perfectly (ahh the pun). Tables, columns, page numbering, line numbering, graphics, file import, headers, background saving and document recovery, footers, formatting, font changes, indenting, paragraph numbering, outlining, printing to pdf from within WordPerfect - everything I needed to work, just works.
Some Linux shortcuts overrides that of WordPerfect, but then use the menu or menu keyboard shortcuts.
However - macros and macro dependent functions does not work (like fill-in templates of documents). You should also know when you start WordPerfect to click on the splash screen/panel alternately a few times until a dialog box comes up complaining about "entrust" something or other not being there. Kill that and WordPerfect vanishes from your screen. Restart it again and it comes up working and will just keep on working without a glitch (unless you mess around with macros - do that if you really want to kill it).
Last I tried it under Crossover it didn't work and I dont know why, but I suppose it soon will. Maybe some developer may even read this and work on the macros and start-up problems to add another Platinum product to Crossover and Wine.
If you can live without using macros (I can) and you can balance a beach ball on your nose for a few minutes to get through the start-up (I do that too) then it's as solid as a rock, good enough to commit your work documents to it. At some stage in the last month I had it open for eight days on one stretch without a single mishap. In fact I have had no mishap with any documents I have worked on so far at all.