lukast wrote:the clipboard viewer was again showing nothing.
You were looking at the listbox labeled "Data Formats", weren't you? If the right side displays "( no viewer is available for this data format )", as in your screenshot, that does not mean that there is no data in the clipboard, only that the contents cannot be shown by the viewer.
lukast wrote:for this object, i indeed see nothing in clipboardviewer, or in wordpad if i try to flush it by ctrl+v.
You cannot flush the clipboard by ctrl+v. You can past the contents as many times as you please. Without any 3rd party tool you cannot clear the contents of the clipboard. The only thing you can do is to replace the contents by some other contents. (There used to be a clipboard viewer and sharing tool in Windows, which was able to clear it, among other things, but it is not any longer.)