Telescope 1.0.2 (extras-devel)

• In rare cases when Telescope is unable to grab window screenshot it will draw gray checkers instead of one. It could happen if you still use useless “Minimize” window button.
• Telescope will not appear when no windows are running. If you close last window inside Telescope using “X” button, Telescope will hide.

jwernerny
Unfortunately, this issue can't be easily resolved. This is side effect of enabling Composite X11 extension that Telescope uses. (This extension allows to monitor window contents event if window is not visible and it is used by all modern linux desktops.) Due to some bug in whether Composite extension or in XVideo extension in Maemo's X server, video overlay is always drawn on the top of all windows when composition is enabled.
On Diablo Composite is disabled by default and it seems that Nokia didn't event tested it with video.
Telescope includes stupid workaround for this case: when you call Telescope from MediaPlayer in order to switch to another app, Telescope will minimize MediaPlayer and video will be hidden (and paused). The same workaround is for liqbase which uses XVideo too.
But yes, this is not the solution for popups.