Q: Installation fails with "Undefined variable: current_step in ..." PHP error

A: This problem is present if your PHP5 is forced to work in PHP4 compatibility mode (activeCollab can't work in such environment). To fix this:

1. Opet your php.ini file
2. Find zend.ze1_compatibility_mode and set its value to 'Off'
3. Restart web server for changes to apply

If you can't access php.ini, but you can configure PHP through .htaccess files (consult your hosting provider about this) you can put this line:

php_value zend.ze1_compatibility_mode 0

in .htaccess file to disable zend.ze1_compatibility_mode. You need to put .htaccess file in folder through witch Apache is accessing activeCollab (usualy it is activeCollab folder, but it can also be /public if you set it up to go through it).