Hi Richard,
Please download and install the latest Service Pack and Patch for PCo 2.3 in Service Marketplace, from Support Portal->Software Downloads->Support Packages and Patches->A - Z Index->P->SAP Plant Connectivity->SAP Plant Connectivity->Win32->PCo23SP03P_7-10012010.exe. Lets first see if this newer SP addresses any of your issues.
Regards, Steve
