Snapshot pro

I have recently relocated a multisite network to here:

I had some issues with plugins and had to deactivate all plugins and turn them back on one at a time, to troublesoot issue.

Issue is snapshot. Every time I activate it, it crashes the entire network. I then have to delete the plugin file from the server, to get the network to deactivate the snapshot plugin and get the network back up.

This is only error I am seeing: is currently unable to handle this request.
HTTP ERROR 500 (I have attached a screen shot)

Server info:
PHP Version 5.3.3
memory limit: 128M
max execution time 120

Why would this plugin not activate? What can I do, really want to use it.

- Dave