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I would avoid xtContuedo (it's very old) but
Content 0.6 - the one with custom page titles - installs and works fine for me on XOOPS 2.0.16, although see my comments for the module in the repository regarding a small bugfix.
The only permissions that needs to be set AFAIK is 'content/content' to 777 and that's only needed for HTML page wraps. I would try re-uploading (make sure your FTP application sends PHP files in ascii/text mode).
I can't test this myself with XOOPS 2.0.18 for a while, but would be interested to hear if anyone else has experienced problems?
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