Mysterious black or white squares appear

Sometimes when editing a black or white square will appear over the image on the display. It stays on the image and I can't get rid of it. It is not saved and my image displays normally when I reopen the file.
I haven't figured out what causes this, but it only happens after I edit something or move the frame on the screen. It is intermittent. Next time it happens I'll grab a screen shot.
Ideas?
Thanks,
Carl

Google updated the plugins recently to correct this problem:
https://support.google.com/nikcollection/answer/4400822?hl=en&ref_topic=3001406
Version 1.109 (December 11/2013) is the latest:
Fixed black or white tile artifacts that might have occurred after returning to Photoshop from plug-ins
You can find out the version you have installed by launching Photoshop:
On Mac: Select Photoshop>About Plug-in>Analog Efex Pro… (or any other NIK Plug-in)
On Windows: Select Help>About Plug-in>Analog Efex Pro… (or any other NIK Plug-in)

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Google updated the plugins recently to correct this problem:
https://support.google.com/nikcollection/answer/4400822?hl=en&ref_topic=3001406
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