SkinManager - assertion during message pump.

vs2013 on windows 7...v17 - beta3
We are using SkinManager and running into some issues...

In particular, we have several threads that execute various processes.  During the processing we have a PumpMessage loop that we've use for years (many years), without issues.  With ToolKitpro however, and the hooks that the SkinManager attempts, we are seeing assertions from

 CXTPSkinManagerApiHook::CallHookDefWindowProc

a process that is called byCXTPSkinManagerApiHook::OnHookDefWindowProcA

Which is called by our  PumpThreadMessageLoop()
A code fragment from the pump loop follows (a typical function)

   while (::PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) {
      if (!pThread->PumpMessage()) {
         return FALSE;
      }
   }

The assertion ONLY happens after we switch Skins via the LoadSKin()...
It NEVER has an issue if the Native theme...(non-theme if you will) is called.  LoadSkin("","");

???? Confusing...