If you use Google Chrome on OS X Yosemite you may have notice that the save, and possibly the open, file dialog box keeps growing and in some cases will expand right off of the screen.
As far as I know there is no permanent solution to this yet, but in the meantime you can run the following commands in terminal to temporarily resolve the issue and shrink the dialog box back down to a reasonable size:
defaults delete com.google.Chrome NSNavPanelExpandedSizeForOpenMode
defaults delete com.google.Chrome NSNavPanelExpandedSizeForSaveMode
This will shrink the window down, but as you open/save files it will expand again, so you will have to run this periodically.