Project keeps creating a Media Cache folder on computer's hard drive and filling it with .ims files

Since I updated to Adobe Premiere Pro CC 2014 the project keeps creating a media a "Media Cache Files" folder on my computer's hard drive and filling it with .ims files until my hard drive is full. This happens even though I have told the project to put the media cache files on an external drive. The project also creates a Media Cache Files folder on the external drive and fills that folder with .pek and .cfa files. Anybody know how to prevent the project from creating this folder on my computer's hard drive?