Regarding HFS+ for Windows, it comes with this warning, "Due to specifics of Windows Fast Startup option we recommend to disable it before installing the driver to avoid possible file system corruption."

Does this mean that just DURING the installation process, that fast startup should be disabled? (meaning that the HFS+ installation process is incompatible with fast startup)

Or is it trying to say that fast startup should be disabled at all times that HFS+ is installed on the Windows system? (meaning that HFS+ is totally incompatible with fast startup)

Can you provide further details about the root cause of the problem?