Our PHP-Selector work wtih DirectAdmin only if PHP is running in suphp or fcgi mode. Here is the complete set of commands to enable selector on DA with suphp :

Same way for fcgi mode.

When you see Segmentation Fault in different random places it could be caused by bad/broken libz* and libxml2. It usualy happens on DirectAdmin server, when libraries are placed into /usr/local/lib/ directory. To fix: