I recently purchased a new late 2013 15-inch rMBP with Mavericks installed. Previously I had a 2008 15-inch MBP which I eventually did also upgrade to Mavericks prior to purchasing my new computer. The issue I have been having is sometimes when I go to save a file, the "Save" dialogue box pops up with the Finder window allowing me to navigate my hard drive. Quite frequently, I get the spinning wheel in the box indicating that the Finder is figuring out what files/folders are in each directory. In the meantime, the main window that displays the contents of the current directory is blank. As I navigate through folders on the sidebar the pinwheel thing continues to spin and nothing shows up in the main finder window. Then if I cancel the original save attempt and load the save dialogue again, often everything will pop up immediately. Any insight as to what is going on or why this is happening?