TableTools button collection does not work properly in IE

Hillriegel

Using IE v.11.x.x, I can implement TableTools. If I use a button collection that includes both CSV and PDF, the PDF will work as an export if it's the first button that is clicked. But not if it is a second choice (say, after CSV). This is true on the example on datatables.net, too (https://www.datatables.net/release-datatables/extensions/TableTools/examples/collection.html) Try it in IE. Save as CSV. Then click the PDF button... nothing happens.