xikar wrote: Take a looking at:
[url]http://www.xtuple.com/docs/userguide/system13.php#970413[/url]

You have to create a key file before you can enter all of the Credit Card Configuration settings.

How to fix this:
Create a new text file with a text editor such as Notepad.
In the text file, enter your key, for example:
[b:dee143328a]OpenMFGkeyText12345[/b:dee143328a]
Save this file, for example:
[b:dee143328a]OpenMfg.key[/b:dee143328a]
Save it to a folder where you want to store this key, for example:
[b:dee143328a]C:\\KeyFileFolder\\[/b:dee143328a]

Now open the PostBooks Client.
Go to:
[b:dee143328a]\"System > Master Information > Credit Cards...\":[/b:dee143328a]
The following error will display:
[b:dee143328a]Cannot read encrypted information from database.[/b:dee143328a]
Click on the \"Key File\" tab.
Enter your Key File Name, for example:
[b:dee143328a]OpenMfg.key[/b:dee143328a]
Enter your Key File Location for your system, for example:
[b:dee143328a]C:\\KeyFileFolder\\[/b:dee143328a]
Click on Save and then [b:dee143328a]Restart the PostBooks client[/b:dee143328a]
Go to:
[b:dee143328a]\"System > Master Information > Credit Cards...\":[/b:dee143328a]
Now there is no error and the Login and Password fields are no longer grayed out.

You should make your \"Key\" a long string on random upper and lower case letters and numbers.  Special characters should not be used.  You should also make the key file, for example, \"OpenMfg.key\" a hidden file and also make the directory it is in hidden.  Do not use the actual key and file name and location I gave above, those are just an example. -- Read more at http://www.xtuple.org/phpBB2/viewtopic.php?t=202