See if this works: Stop tcserver and java processes, clear cache from user folder (delete Teamcenter, Siemens folders and fcc files) and start RAC again.
Before deleting anything, try the check out and then check in of the part or component of the NX assembly navigator context menu.
Production: NX10.0.3, VERICUT 8.0, FBM, MRL 3.1.4 | TcUA 10.1 MP7 Patch 0 (10.1.7.0) | TcVis 10.1
Development: VB.NET, Tcl/Tk Testing: NX11.0 EAP, NX12.0 EAP
How to Get the Most from Your Signature in the Community