I'm getting strange crashes at the moment too. Mine happen when I try to delete animation keys inside a symbol.
Can you be a bit more specific about the issue? Does it happen for any specific composition, if yes please share with us that composition in zipped file. I assume you are using 2014.1 version. You can have both both the versions of Edge older as well as the latest, go to this page HTML animation | Download free Adobe Edge Animate CC trial and select the version Animate CC (2014) from the dropdown version list and download & install it.
We have fixed that crashes which happens while deleting keyframe in symbol, and will be available very soon with the upcoming release of Edge Animate.
Basically I would just bring in some images from photoshop and then go to mask them by making a rectangle and it would just crash.
I uninstalled the 2014.1 version and reloaded the older one. Everything was fine once I reinstalled the older version.
I guess there are some issues with the new version.
Thanks for your help.