If you are using the improved map mod(IMM), then you do not need any fix mods.
So, delete ALL the fix mods. Update your IMM to the latest version. Update the hex colours mod to the latest version and the red icon mod, if you are using it.
This will ensure you have no white squares as all my mods are up to date and the IMM has been permanently fixed by the mod creator.
If you still see white squares then you have some other mod that is interfering.