It is odd. I am getting the same results. I get text when run from command line, but nothing when i run the same thing from kix.

CMD line:
 Code:
manage-bde -status > c:\users\shane\desktop\testbde.txt
results in a txt file containing
 Quote:
BitLocker Drive Encryption: Configuration Tool version 10.0.10011
Copyright (C) 2013 Microsoft Corporation. All rights reserved.

ERROR: An attempt to access a required resource was denied.

Check that you have administrative rights on the computer.
where as the following Kix:
 Code:
Shell "%comspec% /c manage-bde -status > c:\users\shane\desktop\testbde.txt"
results in an empty text file.