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Since updating, my background eraser tool fails to remove even the simplest backgrounds. For example, if I have a simple black line drawing on a white background, even with tolerace set to 100% there is still a lot of white left behind. This used to work perfectly, effortlessly and always did a fantastic job. Is there any reason it's not doing this now? I have it set to sampling one colour and contiguous.
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I would start by resetting the Background Eraser Tool by right clicking on the big Background Eraser icon on the left hand side of the tool options bar and clicking Reset Tool.
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Hi @JayAussie999, if the tool reset that @Jeff Arola suggests doesn't fix the issue...
Let's make sure we're in a default state and there are no stale settings somewhere:
Restore your preferences using this manual method:
https://helpx.adobe.com/photoshop/using/preferences.html#Manually 
Does it work correctly?
If that doesn't solve it, you can quit Photoshop and put the Settings folder back.
It may help if we could see your Photoshop System Info. Launch Photoshop, and select Help >System Info...and copy/paste the text in a reply.