Clip Mutes Happening Randomly

In Sonar Platinum I'm noticing that sometimes while editing clips and tracks, all the sudden I'll notice some pieces are missing. Then I notice that clips have gotten muted (not by the mute/solo track buttons, but the specific clip mute which you have to hit K or right click the clip and go to clip mute). I'm definitely not doing either, and it happens quite often... especially when loading and editing old projects made in older versions of Sonar.
 
Any idea what I'm doing that's causing this?
 
Thanks

Hey, sorry I wanted to bring this thread back up because the issue is much more prevalent now. I'm sure there's a setting i can change.... But as i'm trimming takes, some of my clips just get muted on their own. It's not during recording so I don't think it's comping... Isn't that just for recording? I'm set to sound on sound anyway. Any idea what I would want to look for. Thanks!

Oh I see...Well that clearly explains it that that's what happening so I guess the question is... and I took a quick look and I'm not seeing it so I figure I'll just ask... Can comping with the smart tool be turned off? I usually stick with the smart tool when I'm doing all my editing, and I don't want it to automatically mute clips, and it's happening quite a lot when I work with take lanes... I get the purpose of it but I'd love to turn it off.

Damn. Well I definitely see the use of the tool... Just gotta get used to it... so top does fades, middle cutting or whatever its called, and bottom comps with other takes. Good thing I just got this big higher res monitor haha.