Login/Change Password Page Forbidden on live, fine on local

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Have recently taken an old site, copied it to local and updated it.
It all works great locally, but when live I can't login (Permission Denied after login attempt) or Change my password (the same).

The rest of the site works well.

I used the Database Migration Tool (because I develop on Windows) and these are the missing tables:
areagroupblocktypes
areagroups
btsidebarcart
collectionversionblockpermissions
dashboardhomepage
filepermissions
filesetpermissions
pagepermissionpagetypes
pagepermissions
taskpermissions
taskpermissionusergroups

I tried manually changing these to Pascal Case, but that hasn't solved my problem.

Any ideas where I can start?