To reproduce the problem copy and paste the link at the bottom of demo2 and change from TABLE_CONTENT2 to TABLE_CONTENT .
This link should allow you to bring back initial data in the table once you've loaded the other content but it says that input data does not match input format.
As workaround i initialize the table with empty content (0) and then i load after init the table loading content (1). In this way both content (1) and content(2) can be swapped without errors.
But i'd like it to be fixed ;)