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Thank you for your reply, issue has been resolved. doh moment!
I am using Mac OSX 10.10.1 (memory 8 GB 1600 MHz DDR3, graphics Nvidia GeForce GT 650M 1024 MB)
and my version of Photoshop is CC.
I ran into the same problem: I am able to place and view Blur Gallery pins but the adjustment wheel or outer control arounf the pin that allows you to tweak the blur value disappeared after being initially available. Additionally, the placed pin or pins appear to flicker on screen (while in blur gallery mode) until committing the change with the OK button. I have tried restarting both the computer and Photoshop, as well as what some other users have suggested such as View>Show>Edit pins turned on. Nothing has helped so far. I am still able to adjust the blur amount from the Blur Tools slider. thank you.
Can you please share the solution? Edit->ShowPins does not show the outer controls for me. Only the pin is visible,