Currently the respective snap point is used by Advance Steel while running on AutoCAD, but the check-box appears as not checked. This cosmetic issue is fixed for the next AS version - 2014. You will be able to use the snap correctly on this version thou, after selecting it once. .
As for the dimension lines that move after update : please attach a sample model + drawing which after update get the manual dimensions moved, for further investigation. Also, check the the behavior still exist if you delete and recreate the respective manual dimension now, after installing Service Pack 2.