When I upload the store I get the message "There is a diff file checksum error".

[KB]

This can happen if the diff files go out of sync. You will need to delete the following files from your site folder and from the acatalog folder on the server:-

diff*.fil
old*.fil
new*.fil
full*.fil
prev*.fil
cand*.fil

Select 'Web | Refresh Website', this will cause SellerDeck to completely refresh all of the necessary data files.

This can also be done from Help | Troubleshooting | 'Purge and Refresh Web Site' which does the above automatically.