Most of my domains are using PHP4, which doesn't suffer from this issue, so TraceWatch worked fine.
However, I have installed TraceWatch on a domain using PHP5, but modifying register_long_arrays via the .htaccess file didn't work for me. I had to create a local install of PHP5 by copying the PHP executable and PHP.INI files to my domain and configuring the .htaccess file (in the domain root) to use the local installation. This procedure is described in the following wiki article.
After copying the files I modified the PHP.INI file to enable register_long_arrays. I didn't bother with the cron part of the article, as I prefer to update PHP manually every so often by re-copying the files.
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