These issues are resolved in ISE Design Tools 12.1, and the recommendation is to regenerate and implement the Motion Adaptive Noise Reduction v1.0 in 12.1 or later.
Motion Adaptive Noise Reduction v1.0 in 11.4 and 11.5 has the potential for memory initialization issues as documented in the following Xilinx Answers:
(Xilinx Answer 34659) Spartan-6 FPGA Block RAM - Output Register of BRAM does not Initialize Correctly After Initial Configuration
(Xilinx Answer 34712) Spartan-6 FPGA Block RAM Design Advisory - 9K Simple Dual Port (SDP) Block RAM Initialization Incorrect
Please see (Xilinx Answer 33751) for a detailed list of LogiCORE Motion Adaptive Noise Reduction Release Notes and Known Issues.