During your install of GWX the process checked (IIRC) the size of the Basic.cfg & Campaign files, it found that both were not what it was expecting. Therefore you did not have a clean, unmodded install of SH3 1.4b before adding GWX v2.0 and then v2.1.
The GWX website has the info on the proper install proceedure.
Do not expect your current installation to work correctly.
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