If you still running ASD you might wont to consider installing Service Pack SP4.
This update may be applied to any licensed copy of AutoCAD Structural Detailing® 2012 software installed as a stand-alone product or as part of a suite, with or without installed Service Packs 1, 2 and 3. This update includes Service Pack 1, 2 and 3 so you do not need to install them prior to installing Service Pack 4.
After installing Service Pack 4 it is strongly recommended that you install ASD 2012_HF1 and ASD 2012_HF2 which are the supplement fixes available for AutoCAD Structural Detailing 2012.
For ASD Service Pack SP4: Click Here
ASD 2012 HF1: Click Here
ASD 2012 HF2: Click Here