Brush size doesn't show on artboard

Question

An annoying bug (another) I'm noticing lately is that the brush size visualization is not working properly.
When I (command [ or ]) resize my brush it does not show the outline of the brush on the art board. It will up to a certain size and then simply turns into the cursor, and then often will stay as a cursor until I zoom in or out.
I have the latest CC update.

Answer 1

Elephant,
Its working in CS4 and CS5 seems to rule out a language setting issue.
And with the Align to Pixel Grid out, too, you may consider a more general error condition.
The following is a general list of things you may try when the issue is not in a specific file (you may have tried/done some of them already); 1) and 2) are the easy ones for temporary strangenesses, and 3) and 4) are specifically aimed at possibly corrupt preferences); 5) is a list in itself, and 6) is the last resort.
1) Close down Illy and open again;
2) Restart the computer (you may do that up to 3 times);
3) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);
4) Move the folder (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible);
5) Look through and try out the relevant among the Other options (follow the link with that name, Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy, Item 15) applies to CC, CS6, and maybe CS5);
Even more seriously, you may:
6) Uninstall, run the Cleaner Tool (if you have CS3/CS4/CS5/CS6/CC), and reinstall.
http://www.adobe.com/support/contact/cscleanertool.html