Lr Classic CC Adjustment Brush Size no longer visible, bracket keys don't work

[SW Rick]

I am using latest LR Classic CC on an iMac with latest OS. 

After using the program for a while the left/right bracket keys no longer work to change the brush size, and the slider for size adjustment in the panel no longer shows the size as you slide it.   The size slider keeps resetting itself to the very left-hand side of slider line after you move it to the right.  When you start painting, the brush shows up as you paint, but no way to know what size it will be or to change it via the bracket or the panel.

When you move the Size slider in the panel, the cursor (which should remain a cursor as you slide the control) changes into what I'd describe as a vertical line with a minus sign on the left and a plus sign on the right.

If I quit LR and restart it, the brush works again for a while, until it doesn't.

Any thoughts on what's going on?

[Tony_See]

Could you please supply a "click-by-click" sequence as you work up to the point where your error is replicated?

With respect, not 'just after a while' . . .

Which type of pointing device are you using?

[SW Rick]

Since this seems to happen somewhere between 30-60 minutes into a session, hard to give a click-by-click sequence.  Basically, select the adjustment brush tool, set the parameters, adjust brush size or move cursor over image to adjust brush size.  So since I don't keep- track of each session, hard to say what the lead-up has been.

Using an Apple external bluetooth trackpad and bluetooth keyboard.  Never a problem until recently.

[Tony_See]

Would I be correct in assuming you are using the trackpad to edit LR images then, not a mouse?

[SW Rick]

Yes, that is correct.

[cmgap]

Have you reset your preferences recently? If not try that... Quit Lr > hold down Shift + Option key when restarting Lr and say yes to reset preferences. Please let us know if that helps.