User Defined Symbols attached to dimensions are not created in the selected location or with the expected orientation.
Solution
This issue can be resolved by running the 'Version Up' command on the view (or the drawing) and then recreating the dimension. The User Defined Symbol will then be created in the selected location and with the expected orientation.
Notes and References
Hardware/Software Configuration
Platform: INTEL
OS: window
OS Version: 764SP1
Product: NX
Application: DRAFTING
Version: V12.0
Function: SYMBOL
Ref: 001-9338892