Hi, Mirek, tks for your help, it's weird indeed, I've run a number of tests on both of my systems and here's my feedback on some of the points you raised:

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What is your OS exactly? Compiler?

Windows 7 - MSC9 and Windows 8.1 - MSC9 and MSC10

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As first quick test, does DnD of text to theide work for you?

No, it doesn't work in Win 8.1, but it does work in Win 7.

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Alternatively, you can test with examples/UWord, with Image.

Did that, pls review code posted below, which I used to run tests, along with attached table pics summarizing results:

#include <CtrlLib/CtrlLib.h>

using namespace Upp;

struct MyApp : TopWindow {
	virtual void CancelMode();
	virtual void Paint(Draw& w);
	virtual void DragAndDrop(Point p, PasteClip& d);
	virtual void DragLeave();

	Image img;
	String txt;
	bool  dnd;
	
	MyApp() { dnd = false; }
};

void MyApp::Paint(Draw& w)
{
	Size sz = GetSize();
	w.DrawRect(sz, dnd ? SColorInfo() : SColorFace());
	w.DrawImage(0, 0, img);
	w.DrawText(10, 10, txt);
}

void MyApp::DragAndDrop(Point p, PasteClip& d)
{
	LOG("DragAndDrop");
	if(AcceptImage(d)) {
		img = GetImage(d);
		txt = "";
	} else if(AcceptText(d)) {
		txt = GetString(d);
		img.Clear();
	}
	dnd = d.IsAccepted();
	Refresh();
}

void MyApp::DragLeave()
{
	LOG("DragLeave");
	CancelMode();
}

void MyApp::CancelMode()
{
	LOG("CancelMode");
	dnd = false;
	Refresh();
}

GUI_APP_MAIN
{
	MyApp().Run();
}

Could these erratic results be due to non-standardized Windows DnD obj formatting from one version to another?
Tks!