This is a know bug within earlier versions of CallScripter where the fields within the advanced options are either not displayed or hidden out of view.
This is mainly seen when newer versions of IE are used.
It is not known exactly which version of CallScripter this issue started in, however there is a workaround :
1. Open the advanced properties for the conditional button.
2. Right click in the field, and select 'Properties'
3. Copy the Address:(URL), then paste it into a new browser window.
4. Use the features of the control within the new browser window.
This bug has been resolved within the latest version of CallScripter.