Do you have automatic relations turned on while in sketch mode? (tools>sketch settings>automatic relations)
-L@P.I.D.
Work: Dell PW690-Intel Xeon E5345 2.33GHz-PNY QUADRO FX3450 Drivers 77.56-4GB DDR2 FB-DIMM 667MHz ECC-80GB 10K-250GB 7.2K-Win XPx64-SW2007 SP2.2-RHINO 4.0 SP0
Play: Intel X6800 Core 2 Extreme - Asus P5W64 WS Pro i975X -2GB Corsair XMS-EVGA NV7900GTO(Mod. GTX Bios , FW93.71)-74GB Raptor-250GB WD Caviar