Dear Darkwraith,
I confirm that I run the italian version of SH5 on an italian Windows 7 OS.
I had Vista before but, in the same configuration I did not experienced the problem. This was the consideration that let me think that the problem should have been something related to the OS...
For what concerns the version of your MOD I'm currently trying the test version 3.1.0 but I have also tried the 3.0.4 and its the same...
I re-tested it few seconds ago and I confirm that, running the SH5 executable as administrator it works fine!
EDITED: without changing anything I restarted the game with my user account and the problem is again there: 0.0 mast height!!!! I think we can definitely say that the problem was a Windows file access permission one!!
... I want also to try taking ownership of the games directory (it was installed as administrator but I did not expected problems, being a member of administrators).
Bye,
Mith