I posted a new item in Products a few days ago.

I went in to edit it yesterday and when I published it, the Google
Checkout option was gone!!!  Since Google Checkout is the only payment
option I accept, this is really bad. I had to fullfil my last order
directly with the customer over the phone.

Ok...So I have spent the last 24 hours trying to get stuff posted
again via bulk upload and manually and my Google Checkout option is
still gone.

I had to pause my Adwords campaign until I can get this back up so I
am not wasting money.

Why did this happen?

When will it be fixed?

(1) link to an e-commerce site:
    - no payment_accepted attribute.
    - payment_notes: Google Checkout

(2) no link to an e-commerce site:
    - payment_accepted: GoogleCheckout
    - no payment_notes

this assumes you don't have a multi-client account
you're not under review by google, and you've met
and passed all google-checkout-badge requirements;
approval can take up to 10-business days.

there's a google-checkout group
which can also help with details.

http://base.google.com/support/bin/answer.py?answer=43919
Does Google Checkout work for items submitted via a data feed?
http://base.google.com/support/bin/answer.py?answer=25396
Google Checkout on Google Base-hosted item pages.
http://base.google.com/support/bin/answer.py?answer=69603
Google Checkout on my website
http://base.google.com/support/bin/answer.py?answer=64770
Google Base and Google Checkout accounts are linked?
http://base.google.com/support/bin/topic.py?topic=8288
Google Base Help Center