I'm using the built in arpeggio on one of my tracks.  I'm using automation to turn it on and off.  It works like a charm when that specific track is highlighted, but when I focus on a different track, the automation doesn't work.  It only seems to work reliably when the arpeggiated track is highlighted.  This makes it difficult to work on other tracks and keep the arpeggio going at the same time.  Is this behavior normal?  Thanks  for your replies.  

Is de read automation button checked?

Yes, it's already automated and responds perfectly when highlighted.  The read button is engaged.

Does nobody use the arpeggiator?  Am I in the wrong forum?

This is a known bug which I reported back in 2012: http://forum.cakewalk.com/BUG-arpeggiator-onoff-automation-doesn39t-work-unless-track-is-selected-m2743547.aspx
 
There is another related issue in which automating the on/off switch of a ProChannel's FX Chain does not work unless the ProChannel in question is open in the console. I reported this on the forum some years ago too, and was told by Cakewalk that fixing the bug in question would break a whole bunch of other code, so they had no plans to fix it. I wouldn't be surprised if the same was true of this arpeggiator bug. 
 
FWIW, I find that a good workflow for using Sonar's arpeggiator is to get it set up how you want it and then bounce the MIDI. You will end up with all of the arpeggiator notes in the piano roll. This is amazing for a couple of reasons - firstly, you can turn the arpeggiator on or off simply by removing the relevant MIDI notes, and you can go in and fine tune the arpeggiator notes and turn them into something which the arpeggiator could never do. By deleting some notes and adjusting others, you can come up with some really cool lines which don't sound like an arpeggiator at all. Sometimes it's good just to have the arpeggiator lay out a bunch of notes which you can use as a "base" to tweak into something different. 

sharke
 
FWIW, I find that a good workflow for using Sonar's arpeggiator is to get it set up how you want it and then bounce the MIDI. You will end up with all of the arpeggiator notes in the piano roll. This is amazing for a couple of reasons - firstly, you can turn the arpeggiator on or off simply by removing the relevant MIDI notes, and you can go in and fine tune the arpeggiator notes and turn them into something which the arpeggiator could never do. By deleting some notes and adjusting others, you can come up with some really cool lines which don't sound like an arpeggiator at all. Sometimes it's good just to have the arpeggiator lay out a bunch of notes which you can use as a "base" to tweak into something different. 

 
Good suggestion Sharke

Crazy story about the non-bug-fixing tho!

That's a great idea which I've already used in the past.  This is no big deal, but I was just curious what was going on with the arpeggiator.  It seems like there was a time in the past when it worked as expected.

How to remove arpeggiator info from inspector view?
I would like to use that space for something else.

 

2coolmuisc1
How to remove arpeggiator info from inspector view?
I would like to use that space for something else.

 Can't be done.
You can't remove the arpeggiator, nor can you customise the Midi track to put anything else there