What makes you say the value has not changed? Do you add a watch window or using a script task, msgbox it?
If you have a variable you want to set with configuration, it is simple.
1) Create variable
2) Menu > SSIS > Package COnfiguration
3) Add new
4) Enter a filename, click next.
5) Find the variable in the tree and select Value. (Ensure the checkbox is checked)
That is it.
Now edit the config file with notepad to change the value if you want to.
Remember, the value you see in the variable pane at runtime is not the true value of the variable. The variable pane is a designtime thing.
I can't die, there are too many people who still have to meet me!
It's not a bug, SQL just misunderstood me!