Sometimes when I switch form the console view back to the track view the now time marker is no longer visible. Is there any keyboard shortcut to show/hide the now time marker? I probably accidentally press a key on the keyboard that hides it.
 
Happy New Year!
 
 

How are you switching? By pressing "D"?
What happens if you drag the console window down half-way so you can see Track and Console views and then switch?

I open the console view by alt+2 and close it with the mouse.
 
It sometimes happens when I'm in the track view, zoomed in on a clip. When I zoom out and press play, the now time marker is no longer visible.
 
The only solution then is to close/reopen the project.
 
I work with all windows maximized, so I don't know what happens when console and track views are open together, will try that next time.
 
 

No, they are not "open together". You can drag the bottom/top edge of the window up and down, like a window blind. So although you have the "Console" tab visible at the bottom, you can drag half-way and see both.
 
Then, if you hit "D", it flips the track view to the front and back.
 
But probably the Now marker is outside of your visible window, that's all.
 

It cannot be outside of the visible window as I can't see it at all after pressing Shift+F to see entire project. Also, when I click on the time ruler, let's say on the 3rd measure mark and press Space, playback starts from there but the now marker is nowhere to be seen...
 
 

Ah. I am now trying it in my X1 and I am getting similar effect.
Trying to make sense of it ...

Yes, repeatable.
Shift + F fullscreens the track I just recorded, but it also kills the Now marker.

...and now I cannot make the Now marker disappear again.
But I am getting other strange effects in X1, such as when I move a window size, it is not redrawing correctly.
No, sorry, I am not getting very far.

This has been mentioned before, and it seems there are two potential issues. One is that this can happen in older versions of SONAR, another is that a graphics card driver needs updating.

I can't recreate the problem. It seems to be happening at random.
 
I have the latest driver for my graphics card (960gtx) and the latest version of Sonar Artist.