Unhandled Error in the Application

Just upgraded to OME 2.1 (from 1.3) and I'm getting the following error every now and then via the web portal (FireFox):

[Arg_TargetInvocationException]
Arguments:
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See go.microsoft.com/fwlink;Version=5.1.40728.00&File=mscorlib.dll&Key=Arg_TargetInvocationException

System.Reflection.TargetInvocationException: [Arg_TargetInvocationException]
Arguments:
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See go.microsoft.com/fwlink;Version=5.1.40728.00&File=mscorlib.dll&Key=Arg_TargetInvocationException ---> System.Exception: The data cache did not refresh correctly.
Method timed out: LoadDeviceCapabilities(...)

   at SmartConsole.DataCache.FaultTolerateTimeouts(Dictionary`2 waitHandles)
   at SmartConsole.DataCache.Load()
   at SmartConsole.DataCache.<Load>b__1eb()
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at SmartConsole.Update.UpdateManager.<>c__DisplayClassd.<executeThread>b__b()
[Arg_TargetInvocationException]
Arguments:
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See go.microsoft.com/fwlink;Version=5.1.40728.00&File=mscorlib.dll&Key=Arg_TargetInvocationException
System.Reflection.TargetInvocationException: [Arg_TargetInvocationException]
Arguments:
Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See go.microsoft.com/fwlink;Version=5.1.40728.00&File=mscorlib.dll&Key=Arg_TargetInvocationException ---> System.Exception: The data cache did not refresh correctly.
Method timed out: LoadDeviceCapabilities(...)

   at SmartConsole.DataCache.FaultTolerateTimeouts(Dictionary`2 waitHandles)
   at SmartConsole.DataCache.Load()
   at SmartConsole.DataCache.<Load>b__1eb()
   --- End of inner exception stack trace ---
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)
   at System.Delegate.DynamicInvokeImpl(Object[] args)
   at SmartConsole.Update.UpdateManager.<>c__DisplayClassd.<executeThread>b__b()

* * * * * * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * * * * * * *

The data cache did not refresh correctly.
Method timed out: LoadDeviceCapabilities(...)

System.Exception: The data cache did not refresh correctly.
Method timed out: LoadDeviceCapabilities(...)

   at SmartConsole.DataCache.FaultTolerateTimeouts(Dictionary`2 waitHandles)
   at SmartConsole.DataCache.Load()
   at SmartConsole.DataCache.<Load>b__1eb()

* * * * * * * * * * * * * * * * * * * * * * * *
* * * * * * * * * * * * * * * * * * * * * * * *
Local Stack Trace:

SmartConsole.ErrorHandler >> Show
Dell.OME.OMEProxyManager >> ShowError
SmartConsole.Update.UpdateManager+<>c__DisplayClassd >> <executeThread>b__b
System.Threading.ThreadHelper >> ThreadStart_Context
System.Threading.ExecutionContext >> Run
System.Threading.ExecutionContext >> Run
System.Threading.ThreadHelper >> ThreadStart