Wouldn't you know it, seconds after I posted the upload problem, my last experiment with 20MB finished okay. I discovered another settings that looked suspiciously useful. If you set the properties on the Blob before upload it seems to overcome the default limit:
BlobRequestOptions .ServerTimeout .MaximumExeceutionTime I don't if both are needed due to lack of experimenting time, but now my uploads are going again. Setting the same properties on the Blob client also works. *Greg*
