Your comments

Perhaps if you move the workspace file out of your project directory (if you are using projects) so that Sublime doesn't start with anything.

Maybe it's Windows specific?

But that sucks.

What OS are you on?

I am not able to make it crash on Debian Sid. But maybe I'm lucky? Hope they are able to fix that problem, as I see others are experiencing the same. (Could be a package conflict?)

I switched to using the package LiveCSS - it works for hex and rgb/rgba - and it does it without the need to hover. Try that one too - you might like it. :)

I am using this with the ColorPicker package - works great. :)

I use the ColorHighlighter package - it handles hex fairly well. I wish it could handle rgb/rgba too. But it's a start.