Yes, there may be an updated version of PHX that works with more recent PHP versions.
BTW, I think I have seen that error caused by magic_quotes_gpc being turned on.
Another option would be to paste the PHX code into a really good code editor (e.g., PhpStorm, NetBeans, or PhpEd) and see if it highlights any errors.
FYI, MODX Revolution has PHX built into the core.
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PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODx info for everyone:
http://bobsguides.com/MODx.html
[ed. note: BobRay last edited this post 12 years, 11 months ago.]