WinCC CCRtsLoader.exe memory leak - Unhandled exception was raised

We are experiencing a sudden bout of crashes of our project PC's. Getting a windows popup that reads "Unhandled exception was raised. Look WinCC Diagnose directory for details". When the popup occurs the project ceases to log or update tags until runtime is restarted. Sometimes runtime cannot be stopped forcing us to reboot the PC.

After some investigation, it appears that the CCRtsLoader.exe process is "leaking" memory, as monitoring of that process reveals the memory usage climbing by 256K per minute or more until it causes a crash. (Watched memory usage grow from 29,340K to 91,456K in 40 minutes). After one crash, the memory usage for that process was over 1GB.

Using WinCC Professional V11. This is occuring on both Windows XP and Windows 7 PC's. There has not been any change to the project code/configuration.

Thanks in advance for your prompt assistance.