Photo Screen Saver not functioning with Yosemite Upgrade

WHY CAN THIS NOT BE FIXED!!!!???

I am also having this issue and it makes the photo screen saver feature worthless because it only works one time. My family really enjoyed this feature as our computer is out where we can see the images while doing other things.

When I choose to use the "Faces" option of iPhoto it works only the first time slept. The second time it displays for 1 second: the bottom 2/3 of the screen black, and the top 1/3 a garbled image of several rows of 1/2"x1/4" slices of colors that appears to be a video card or video memory issue.

If you also have this problem please add your name to the list by clicking on the "I also have this problem" link at the bottom of the very first message of this thread.

Using Yosemite 10.10.01 - iMac (20-inch, Mid 2007) 4 GB, ATI Radeon HD 2600 Pro 256 MB

All fixes are temporary! This is driving me nuts. Not only did my computer lose the capability to create a photo using the mosaic option, which I loved, now I keep seeing the same Nat Geo pics over and over. Please fix it and what ever happened to the option to see the mosaic photos? That was so cool!

Had it working for a long time. Until I updated Yosemite 10.10.1 now I'm back to square 1 with regards to Screen Saver/iphoto function.

Also noticed poor Blue tooth reception and periodic uncoupling of blue tooth device followed by screen saver reverting to Nat Geo folder. Arrrrrgh.

humm ... after days and days of my mac book pro working and never reverting to National Geographic ...

I changed the file I was using for the screen saver - and voila - now my mac book pro (retina) is now

also in love with National Geographic --- what a mess and certainly not "our" problem ... when is Apple

going to fix this - or even acknowledge it? very very annoying ...

This is pretty annoying.

I don't know why Apple has to keep fixing things that aren't broken. The last major OSX version upgrades have done nothing except add more useless features that no one uses (I venture to say that less than 1% actually use "mission control"). I'd also venture to say that they don't care about breaking your screensaver, as evidenced by a lack of response from an apple rep.

Enjoy the penguins and other nat geo imagery.

Apple does not comment in these threads. You won't get a response from an Apple rep here. That doesn't mean they aren't aware of the issue.

I had the same issue after upgrading to Yosemite. I tried the plist deletion with restart, which worked for a day, but then I had the same issue again.

Apple recommended to do a Repair Disk Permission within the Disk Utilities, so far it seems to work fine.

That took a while in my case, but so far so good, I haven't seen the National Geographic for a while yet...

Can you post a link to the recommendation from Apple - this would be helpful. Thanks.

looks like we all have the same problem. I spent 6 hours with vaious Apple support.

They had me remove 2 plist files which I thought worked ,but after 3 days, I was back at

the default to NG. I spoke to another support guy who had me do a command,oprion RP,

which clears out the RAM.

Eureaka it worked, for a little while and then failed.

I called my Senior advisor ,who gave me her ID ,phone number etc., but sedpite 3 call

and 1 email. I never got a response. So what we have is a systemwide bug in Yosemite.

Thanks so much for this answer. It seems to have solved this problem that I've been chasing for several days.

Thanks for the suggestion to do a Repair Permissions. My screen saver - so far - has not reverted back to Nat Geo photos. FIXED!

Well my my my, no one from Apple did a ******* thing about thiis widespread pain in the ***, I don't mean pain in the *** as big as Yosemite Catastrophic Failure, but something that warps the **** out us EVERY DAY!!!!!

Today my computer was hijacked my Mac to install 'enhancements' to the Yosemite upgrade. Funny thing, little things started ******* up. Thanks Apple. You waxed brilliantly like a Hollywood starlet and you're waning like Courtney Love after a particularly hard night. I should be to count the times I have a strong urge to hurl your piece of **** out my window. I paid $1300.00 for this diarrhetic series of failures?

It is unforgivable and it beggars belief. . Your software writers should be strung up.

Spoke too soon. I've now been reverted back to Nat Geo. Sad.

I'm afraid resetting PRAM didn't fix it for me.