Right - for Turabian this issue is only with the bibliography but for other styles (Chicago 15th for example) I believe this glitch impacts both footnotes and bibliography setting for repeated authors. Regardless they both seem fixed in the X4.01 beta we are currently reviewing.
Presuming all goes well with the testing, we will post a notice in the forums as soon as the update patch is ready; hopefully just another week or two.
Jason Rollins, the EndNote team