Real time shipping (UPS) doesn't work with GC

[Zen4Me]

Hi,

We upgraded the store to v1.3.8a and install latest GC 1.4.7, the
shipping in the store is UPS only.

We set the module to use Real time shipping rate (merchant calculated,
and disable CCC).

However in google checkout page, there is no UPS real time value, only
the default manual value which we inserted in module setting.

We turn on CCC, and google display them fine, but since the choice is
limited (only 6 methods) we can rely on CCC.

Please let us know what should we do to make Real Time Rate (Merchant
Calculated) works?

Thanks for all helps!

Donny