I swithched from Platinum to Silver membership. Now obviously a difference in the number of images one can display, I found I could not add any new images, so I tried deleting some, to find other, I'm guessing 'hidden' images appearing and the total still at my maximum. Do I have to delete all the images and start again?
I believe it's the same as on most other sites. All your images are left in limbo just in case your card has lapsed, which is very handy if you forget to update your details when the bank issues a new card, or in case you might decide to go back up to your previous level.
If you had the full 250 allowed I reckon you will need to delete 206 until you only have 44 left.
Just before I was downgraded on another site I backed up and then deleted all images until I had the right number for my new status and these days I just delete one before adding a new one.