Visualizations I created a published in Spring 2012 suddenly stopped working -- or rather a customer alerted us to this last week so I'm not sure how long they were inaccessible.
I've republished them and re-exported the code to include on my webpage by my question is, will this happen again? Is there an expiration date on visualizations? It seems to be retaining my view count -- so perhaps there was some sort of update to Tableau Public?
This shouldn't happen--there have been a couple updates to Tableau Public in the last 6 months or so--which could possibly have been the cause. I'll dig further into this. Do you have the link to the workbook?