In my Windows 8 operating system with 64-bit machine, I faced a problem with Endnote 7.
The procedure to get the problem was the following:
Put a table with some fused cells, including cells of the first line, in a column on word 2013;
Put an endnote reference in cells after the first line of the table;
When Endnote (or you, depending on the Instant Formatting option you chose) refreshes the Endnote scripts, Word crashes.
To solve the problem, I had to remove the fused cells. I didn’t found any other solution.
I hope that this will be fixed in the next version.