Blogospherianman
I've never once had a fatal error from using clip follow project and I rely on it heavily. Which version are you using Blacksymphony?

2018.06, but this happens in every versions

I tested on my rig in latestest version of Platinum, the last 2 builds of Cakewalk (including 2018.06), and X1 as well. It worked flawlessly with no fatal errors. Not sure why it does that on yours. Do you have your Windows up to date? Just curious

Blogospherianman
I tested on my rig in latestest version of Platinum, the last 2 builds of Cakewalk (including 2018.06), and X1 as well. It worked flawlessly with no fatal errors. Not sure why it does that on yours. Do you have your Windows up to date? Just curious

I've test on my all 3 pcs,and both windows 7 and windows 10.all of them will crash.

For your issue, it could be project specific. Have you tested with a fresh project and single wav files. Also, I noticed in your screen shot that there were multiple clips of Toms. It's best practice to bounce all audio to be stretched into single Clip per track that start at zero prior to stretching. You've definitely peaked my interest as to why It's not working for you. Easily one of my most used functions of Sonar for many years now.

In my limited experience such an issue can be due to "whatever", especially considering and comparing the very different experiences by Blogospherianman vs. the OP. Audio Snap operations (and similar) are actually quite complicated ones going deep in the material, so they can possibly (?) conflict with, say, any VST or VSTi which is able to mangle with the project material in a similar way, even if the VST isn't loaded in the project in question (but has a complicated install structure, not only single .dll).
I wouldn't be surprised if even different hardware combinations could give such results.
Well...just pondering..
 
OOPS: I just noticed it's a bundle file you're trying to Audio Snap. That could be the key!
You can not, for example, save groove clips in bundle file.
 

I do believe you need to render before trying to play back, though I was just observing you can use Audiosnap to change the tempo of an Audio clip.

It's best to speed up the final two-track mix. For tape-style varispeed that increases pitch and tempo in a related way, use the Loop Construction view but don't use it to create a loop. This produces zero artifacts because no actual stretching of the audio data takes place. I use this technique all the time.