Hello Karsten, how are you? And hello again Ian. Let me now rewrite the problem for clarity's sake, this part of the post being copied and pasted for feedback purpose.
Ever since the upgrade from 10-0-5 to 10-0-6 of FCPX, I have been facing this problem of a non-responding timeline: after a day's work, I usually minimise the FCPX after checking the render box in playback preferences [as I edit with background render turned off] and put my Mac to sleep. Previously, when in 10-0-5, I could, after waking up my Mac, click upon the FCPX icon in the dock and I could start my editing work almost instantaneously. But, after the upgrade to 10-0-6, I find that though the fcpx opens up, the timeline is either inactive or very sluggish. The playhead moves to the place of click after a long time interval or does not move at all. More importantly, the keyboard also ceases to function. The non-functioning of the keyboard I have also encountered even during the editing process itself...it occured twice in the recent past: at the first time I was busy pasting attributes to several clips, and the second time when I was rapidly adding text to titles. The inability to use the keyboard functions is not restricted to fcpx alone, but spreads to other programs as well...I cannot enter text in a word document and neither can I type any address in the address bar of my browser.
The workaround I have adopted to this problem has been this: quitting FCPX and shutting dowm my Mac; next, after starting up my Mac, I first trash FCPX preferences and then open up my FCPX. This done, and things become smooth once again, I can use the keyboard functions not only in FCPX but also in the other programs. If I omit the trashing of preferences step which I mentioned above, the keyboard continues to be dead and the FCPX timeline non-responsive.