Note: Published on The Social Networking Weblog
There seems to be an explanation regarding the upgrade link dissappearing within users Picasa web albums, a Google network where people can upload and comment on photos.
Apparently a user in the Picasa Usernet forum contacted the Google team in order to find out what was going on and received this reply.
Hi [name removed],
Thank you for your note. At this time, you must have a United States billing address to purchase additional Picasa Web Albums storage. As such, users located outside the United States will not see the link to upgrade their storage and they may also see an error when attempting to purchase.
We appologize for the inconvenience and look forward to offering you more
options, for international purchasing, in the near future.
The Google Team
Google's servers were probably trying to figure which users were from America and which ones were not, resulting in the upgrade link disappearing and then reappearing every time the page refreshed.
The upgrade link should be now appearing in American accounts, although it will be interesting to see if Picasa can dethrone Flickr (owned by Yahoo!) once it opens the gates to the international community.