now my Change Address button is gone...

I've just upgraded to 139h.
The Change Address button is now missing on my checkout_payment page.it was there on the checkout_shipping page, in the previous step (to change the shipping address) but with no button here people can't change their Billing Address. I may be overlooking something obvious here. Help, please?

Admin->Configuration->Maximum Values->Address Book Entries ... set to a value greater than 1

Thanks Doc, but its already set at 5 and i've never changed it.

What version did you upgrade from?
What payment modules do you have enabled and why?
What addons do you have installed?

139f->139g-139h
I mainly did the upgrade to change from Paypal Std IPN to Express Checkout.
Payment Modules:
Direct Bank Deposit -Australian
Check/Money Order
Paypal Express (was IPN)
Addons:
ceon uri(seo)
recaptcha
minimum order quantity
back in stock notification
sitemap xml
printable pricelist
easypopulate
using Clyde Jones' Forest path template

ok, it doesn't look like its anything to do with the change to Paypal Express either, because I just changed it back to IPN Std and its still not there....:frusty:

I remember having an "address override" setting in the Std IPN module....maybe that is why its only causing hassles now?!?
I mean, maybe that Billing Address change button has been missing for a while and it wasn't needed because of that override setting??
These are my current settings in PPexpress. Can anyone see any problems here?:
Express Checkout Shortcut Button
Off

Set Order Status
Processing [2]

Set Unpaid Order Status
Pending [1]

Set Refund Order Status
Pending [1]

Express Checkout: Require Confirmed Address
No

Express Checkout: Select Cheapest Shipping Automatically
No

Express Checkout: Skip Payment Page
No

Express Checkout: Automatic Account Creation
Yes

Since v1.3.7 when using PayPal the Change-Address button WILL automatically disappear when operating in a mode which should specifically prevent customers from changing their address from within your store (because they've already selected their shipping address while at PayPal).
It's perfectly normal for the button to disappear under appropriate circumstances.

If it's disappearing for all modules, then it sounds like something in your template or one of your addons has broken the normal functionality.

Yes, it happens with all the payment modules.
If I choose any Payment Type and move on to Checkout_Confirmation and then click the 'edit' button to change the Billing Address I am sent back to Checkout_Payment where there is no 'change address' button.
Could you give me an idea which are the likely files that I should look at? Cheers.

Just like any other template file, look at: tpl_checkout_payment_default.php