TensorRT 4. Reshape Error

I am upgrading from TensorRT 3->4 and am seeing new error which does not occur with TensorRT3:

[TensorRT] UFFParser: Parser error: resnet_backbone_out/Reshape: Reshape: -1 dimension specified more than 1 time

Image of problematic structure: https://imgur.com/8k2fECB

Was there some regression of reshape support in TensorRT4?