Screen Saver on 10.8.3 Fails to Activate

So far, so good, but too early to be sure yet.

Problem back - anyone else? Very boring now.

After failing to work for a while with 10.8.2, my Mac Mini screen saver just started working normally. Yesterday with 10.8.4 it stopped working again. Normally not a huge deal, but when a plasma TV is your display, it does matter.

Absolutely... suppose we must now in hope, wait for 10.9, can't be bothered to send any more feedbacks, since they didn't act on the 10 I have already sent (and the hundreds others have sent) over the last few months.

Mine is related to screen sharing. When screen sharing is disabled, system activates screen saver just fine. However if I activate a screen sharing instance, wether it be connecting to my mac, or connecting from my mac to my fileserver, after that the screen saver will no longer work. Still working on a fix, as I both enjoy screen sharing and screen savers.

I'm also having screen saver not starting issue when I have screen sharing enabled on my 2008 iMac (OS X 10.8.4). If I disable screen sharing the screen saver kicks in just fine. Screen saver used to work (I've had screen sharing on for a long, long time, several OS X releases at least) but started failing only a week or two ago out of the blue. It took me ages to figure out it was the screen sharing setting that caused it, I tried disabling everything else running in bg first, tried safe boot, nothing worked until I disabled screen sharing.

If I invoke the screen saver manually via hot corner it works fine.

I've now got the screen saver set to start after one minute to make testing easier and I notice that in system log almost exactly every minute I get the message:

ScreensharingAgent[<pid>]: [CL_INVALID_DEVICE] : OpenCL Error : Failed to create context! (null)

Note: <pid> is different (incremented) each time.

Disable screen sharing and the message stops of course and the screen saver starts as it should. It seems like whatever is triggering this message is stopping the screen saver from starting.

Final weirdness is that I also have a 2010 MBP also running OS X 10.8.4 also with screen sharing enabled and its screen saver works just fine.

I just saw a list of the fixes coming in 10.8.5 and it gives cause to hope: "Resolves an issue that may prevent a screen saver from starting automatically". Hopefully this will do the trick!

I've had 10.8.5 for a couple of days now and so far the screen saver is working fine. I think it has fixed the problem!