MassTransit Web Client plug-ins prior to version 7.0.1 are not supported for Internet Explorer and Safari browsers running in 64-bit mode.
Currently, versions 7.0.1 and later of the MassTransit Web Client plug-in (available for the latest MassTransit HP 7.0.1 and later Servers) is supported for Safari in 64-bit mode but it is not supported for Internet Explorer running in 64-bit mode. MassTransit Server is supported on Windows 64-bit platforms.