hi changhai,
i don't have any other VMs.
i just experienced the buggy behavior again. here's the snippet from my vmusr.beej.log file, though i doubt it's helpful
===
[Aug 13 12:51:10.492] [ debug] [dndcp] DnDPluginControlProc: got Window Message 0x219 for hwnd 0x1019a
[Aug 13 12:51:10.492] [ debug] [dndcp] DnDPluginControlProc: sending to HandleWindowMessage
[Aug 13 12:51:10.492] [ debug] [dndcp] DnDPluginControlProc: got Window Message 0x219 for hwnd 0x1019a
[Aug 13 12:51:10.492] [ debug] [dndcp] DnDPluginControlProc: sending to HandleWindowMessage
[Aug 13 12:51:10.976] [ debug] [vmusr] Rpci: Sending request='tools.ghi.launchmenu.change '
[Aug 13 12:51:10.992] [ debug] [vmusr] Rpci: Sent request='tools.ghi.launchmenu.change ', reply='', len=0, status=1
[Aug 13 12:51:12.117] [ debug] [dndcp] DnDPluginControlProc: got Window Message 0x219 for hwnd 0x1019a
[Aug 13 12:51:12.117] [ debug] [dndcp] DnDPluginControlProc: sending to HandleWindowMessage
[Aug 13 12:51:30.631] [ debug] [vmusr] RecvMsgCB: receiving
[Aug 13 12:51:30.631] [ debug] [vmusr] CopyPasteRpcV4::HandleMsg: Got CP_CMD_REQUEST_CLIPBOARD[2000], sessionId 1111, srcId 10001, binary size 0.
[Aug 13 12:51:30.631] [ debug] [vmusr] GuestCopyPasteMgr::OnRpcDestRequestClip: enter
[Aug 13 12:51:30.631] [ debug] [vmusr] GuestCopyPasteMgr::OnRpcDestRequestClip: mDest is not NULL
[Aug 13 12:51:30.631] [ debug] [vmusr] GuestCopyPasteMgr::OnRpcDestRequestClip: change sessionId to 1111
[Aug 13 12:51:30.631] [ debug] [vmusr] GuestCopyPasteDest::OnRpcRequestClip: state is 1
[Aug 13 12:51:30.631] [ debug] [dndcp] CopyPasteUIWin32::GetLocalClipboard: we are the clipboard owner.
[Aug 13 12:51:30.631] [ debug] [vmusr] GuestCopyPasteDest::UISendClip: state is 1
===
i'm happy to collect any other useful data and can even give you remote screen control via Messages.app, if you'd like to do some testing.
marc
ps: i'm not getting email notifications of updates to this thread, like i should be. do you know who could look into that?