I normally have the timeline setting enabled that makes clicking on the TC ruler disable smart tools.

In CC mode clocking on the tC ruler throws you back in source/record workspace.If you then choose  CC workspace to return  it won't work until you 'return the workspace to saved' or reset it to default.
This restore the CC workspace.

Bug?

nigelad:

I normally have the timeline setting enabled that makes clicking on the TC ruler disable smart tools.

In CC mode clocking on the tC ruler throws you back in source/record workspace.If you then choose  CC workspace to return  it won't work until you 'return the workspace to saved' or reset it to default.
This restore the CC workspace.

Bug?

You're a certified instructor so I'm sure you know more about this than I do; Have you tried to re-set your user settings? 

Hi Philip,

Yes, it happens consistently with a new user.
Can somebody report this as a bug for 21.6?

nigelad:

Hi Philip,

Yes, it happens consistently with a new user.
Can somebody report this as a bug for 21.6?

If feasible, Could you try to upgrade to the latest version and see if you can re-create the error? If you can, submit a support case: https://avid.secure.force.com/pkb/articles/en_US/how_to/Support-Plan-Case-Creation

The support representatives can report this as a bug to the engineering team.