Please firstly see: S-045580.
This has also been seen on PCs where the sldpropertyhandler.dll was not properly registered on the PC. This can occur due to insufficient permissions during installation.
In order to register the dll, please:
1. Open Windows Explorer and navigate to c:\program files\SolidWorks\SolidWorks
2. Open a command prompt by going to Start > Run > type cmd and hit Enter
3. In the command prompt type regsvr32<space>
4. Drag/drop the sldpropertyhandler.dll file from Windows Explorer into the command prompt and hit enter to register the dll .
regsvr32 "c:\program files\SolidWorks\SolidWorks\sldpropertyhandler.dll