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xconv is replacement for iconv. In case after you use xconv, you always get a blank page, try do this:
For xconv v1.63:
line 44 of class/xconv.php:
if(!($this->getConvFunc())) $this = false;
change it to
if(!($this->getConvFunc())) unset($this);
The old version may result in the following error for some PHP:
Fatal error: Cannot re-assign $this in /XOOPS_ROOT/modules/xconv/class/xconv.php on line 44