Hi,
 
Im trying to figure out why my aux sends stop working after some time. I've set up 2-4 aux sends on the same track and inserted some plugins. They work fine but at some point or another they just dont work anymore. I have to insert new sends and drag over the plugins, and I am back on. 
 
Trying to isolate the problem and its not because i exit the project, or whenever i add a new aux.
 
Thank you!

Maybe you are bypassing the sends globally?  Looks like pressing  ( E ) will dis-able all effects ?
 

Bypassing effects globally
SONAR allows you to globally bypass all audio effects in a project. You can also choose to only bypass effects of a specific category (track, bus or clip).
With global effects bypass, you can:

Quickly compare (A/B) a dry versus a wet mix.


Temporarily bypass all inline plug-in delay compensation (PDC) effects in order to avoid delay compensation induced latency while tracking virtual instruments or input monitored tracks.


Temporarily reduce CPU consumption.

SONAR also has the ability to bypass effects at a per-effect level (effects bypass) as well as at an FX Rack level (rack bypass). Any existing effects and rack bypass states are preserved when you globally bypass and unbypass effects.
You can selectively unbypass individual effects while in this global bypass state, which makes it easy to quickly audition a single effect within a mix.
  
Note: You can only globally bypass audio effects, not MIDI effects.
To globally bypass all effects in a project
 
  
Note: This feature is not available in SONAR Home Studio.

Do one of the following:


In the Control Bar’s Mix module, click the Bypass all Effects button .


Press E.

All FX Racks in the active project are temporarily bypassed. To restore the bins to their original state, click the Bypass all Effects button again.
  
Note: The Bypass all Effects option is only a temporary toggle, and is not saved with the project.
Figure 375. The Mix module.
To globally bypass all track, bus or clip effects
1.
Determine which type of effects you want to bypass (track, bus or clip), and make sure at least one corresponding FX Rack is visible.

2.
Right-click the FX Rack and select Bypass FX Racks Of This Type from the pop-up menu.

All FX Racks of the same type as the source FX Rack are globally bypassed. To restore the bins to their original state, simply toggle the state of the Bypass FX Racks Of This Type option.

Is it possible that the AUX track itself does not have local echo on?

Thank you promidi! That was it. I'm always taking that off on every track cause I do not know what its for, besides the reverb like effect it makes when you turn it on a track.