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{exp:member:custom_profile_data member_id='{member_id}'}{full_name}{/exp:member:custom_profile_data}
The code above doesn't show anything. if I change the {member_id} global variable to a number it does work. Why isn't it working when the variable is in there? {member_id} displays correctly when used outside of the tag.
{member_id} and {logged_in_member_id} are standard global variables. All global variables are parsed after the modules. Take a look at the Template Engine documentation. The modules tags are the 15th item parsed, while the {member_id} is 24th and {logged_in_member_id} is 25th.
So, when the template engine parses the exp:member:custom_profile, the member_id isn't available yet.
By the way, you don't need to fill the member_id parameter because its default value is the current logged member.
You should see ExpressionEngine's Parse Order (http://loweblog.com/downloads/ee-parse-order.pdf). You can see that user defined global variables are being parsed at last.
But if you would like to show the logged in member's profile data there is no need to pass member_id parameter.
See this statement within user doc (http://ellislab.com/expressionengine/user-guide/modules/member/#custom-profile-data-tag)
Specifies a particular member’s information to display. By default (if you do not include the member_id parameter), the tag will simply display information pertaining to the currently logged-in user.
