Which version of ID? Do you have the most recent patch installed?
I have cs6 and have run all updates.
Latest patch is 8.0.2 so be sure...
There's a script that will export in the foreground floating around here on the forum if you search, but if it's just this file, try making a new Book (.indb) and add this file to the book, then export from there -- book export is a foreground task.