Comment 3 for bug 1313446

While the window is shaded (which is not really shaded since there are no window decorations for it -- it's actually missing), it is missing from the window list for an application, which makes it impossible to switch to.

The only way I see to reclaim the lost window is to close or move all other windows of that app so the missing window is the only one left on the workspace, then click on the running app's icon again. Then, the running app is still not listed, but clicking on it raises it somehow.