This happens in PanelMenuView.cpp while its attempting to:
std::string PanelMenuView::GetActiveViewName(bool use_appname) const

Then fails on this line:
else if (!IsValidWindow(window_xid))

Which in this function:
bool PanelMenuView::IsValidWindow(Window xid) const

It is failing on:
!wm.IsWindowObscured(xid)

As for some reason the window is only obscured when using enter to
activate the window. Possibly enter is a bit faster? So there is the
problem... a fix for this will be interesting.

If you comment out that IsWindowObscured(xid) check then it works fine
(but that will cause other problems else where). So we have to figure
out why that window is obscured when only using enter to activate a
window!

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https://bugs.launchpad.net/bugs/1072746

Title:
  window title in panel is missing after "the spread"

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