I installed blur gallery from Toolbox and I get the same issue as the OP... opens and closes, no error. However the blur gallery will work with the blur camera when you view a picture from the camera. Also when I use toolbox it to install Blur Gallery it reboots during install.
This describes my problem exactly. It did work with the download from the toolbox and then all of a sudden it just stopped. Tries to open and then closes. I tried force closing, rebooting, uninstalling then reinstalling, even restored to a nandroid backup from when it worked and still nothing. Has to be the app. And Moe I think it reboots because it is installing through clockwork since it's a zip and not an apk file.