CE 6.0 IHTMLDocument2 don't execute scripts

Hello,
I've got a program written in C++. It was working fine on former versions of Windows CE but now I've got a probleam that the the browser windows I'm using inside that application didn't execute any scripts anymore.
The strange thing is that if I load the url with the IE on that device all is working fine.
when the url is loaded I download the content into a screen:

Code:

---

                if (dStreamMem != NULL)
                {
                        GlobalFree(dStreamMem);
                }

                RELEASE(dStream);
               
                //Create stream
                dStreamMem = GlobalAlloc(GMEM_MOVEABLE | GMEM_NODISCARD,size - (content - dBuffer) + additionalHTMLLen);
                BYTE* dStreamMemBuf = (BYTE*)GlobalLock(dStreamMem);
 

                memcpy(dStreamMemBuf,content,size - (content - dBuffer));
                GlobalUnlock(dStreamMem);

                if (FAILED(CreateStreamOnHGlobal(dStreamMem,false,&dStream)))
                {
                        LOGTAG(Error_Download_CreateStreamOnHGlobal_Failed);
                }

---

then I load the stream in a different method and try to display it in the browser window of my application

Code:

---

        IPersistStreamInit* persistStream = NULL;
        //Get document object
        if (FAILED(pBrowser->get_Document(&dDisp)))
        {
                LOGTAG(Error_ShowPage_pBrowser_get_Document_Failed);
                goto CLEANUP;
        }

        if (FAILED(dDisp->QueryInterface(IID_IHTMLDocument2,(VOID**)&doc)))
        {
                LOGTAG(Error_ShowPage_dDisp_QueryInterface_Failed);
                goto CLEANUP;
        }

        if (FAILED(doc->QueryInterface(IID_IPersistStreamInit,(void**)&persistStream)))
        {
                LOGTAG(Error_ShowPage_doc_QueryInterface_Failed);
                goto CLEANUP;
        }
        if (FAILED(persistStream->Load(dStream)))
        {
                LOG('I', "Load Stream failed!\r\n");
                LOGTAG(Error_ShowPage_persistStream_Load_Failed);
                ret = FALSE;
                goto CLEANUP;
        }

---

The page is displayed in HTML without any errors (or at least it seems so) but when I press a button there nothing is happen.
Anyone an idea what could cause such a behaviour?