Using Object Snaps within Hatch Patterns (Ceiling) in AutoCAD 2012 and Newer

AutoCAD 2012 and 2013 use a default setting of the Sysvar OSOPTIONS that makes it impossible to select the intersection of the ceiling grid, or any osnap within any other hatch pattern, for that matter. To correct this, Go into TOOLS->OPTIONS and go to the Drafting tab. Then, uncheck the Ignore hatch objects selection in the Object Snap Options part of the dialog box.

Or, type in OSOPTIONS and enter 2 as the new value. Also, type in SNAPGRIDLEGACY and set it to 1. A future update will correct both of these automatically.