OK, uploaded a clean backup of the admin/ folder, copied all the module_manager files across and tried again.

Errors reported during first run:

A. - Failed: 1
B. - ERROR: Cannot create table module_version_tracker because it already exists
C. - Note: 1 statements ignored. See "upgrade_exceptions" table for additional details.
D. - Failed to set up version tracker table

My notes:

B. OK, this was becuase of previous install
C. Error message in this table is B.

D. Why not? Maybe this is the problem?

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IE and FF stil lreport exactly the same error......sigh!