Crash loading Achilles Heel

First off, pc specs:

Windows 7 64 bit, 4gb Memory, Nvidia 320M gpu.

Game specs: GalCivII ToA. v 2.04

Problem:

I have been playing dread lords campaign without a problem up until the completion of one campaign... at the start of the next (achilles heel) the game closes with a CTD and error stating the program has stopped responding.

I have attempted loading from end_save & continuing campaign from main menu, both producing the same results.

The relevant section of the debug.err relating to this issue (rather than posting all the irrelevant stuff is this:

Debug Message: Loading custom map: ./Data/English/Campaigns\Achilles' Heel.gc2map (4294967295 x 4294967295)
Debug Error: Invalid galaxy size passed to classGalaxy::SetGalaxySize

Can anyone please assist on how to correct this as I would like to continue the campaign?