I’ve just hit a StorageException with Azure Table Services that does not occur in the local emulator.

Unexpected response code for operation : 5

The only hit on the net for this error is here. That post indicates that invalid characters are in either the PartitionKey or RowKey values. I know that this is not the case for my data set. It turns out this failure also occurs for invalid data in the fields. In my scenario I had a null value pushed into a DateTime property. The result of this is a DateTime value that will not be accepted by ATS.