Snapshot doesn't start even when clicking on run

Hello support, I'm having an issue with one of my websites using the Snapshot plugin.

I run several sites on one server, and 5 out of 7 sites are working perfectly.

However two of my sites, are not working with the Snapshot plugin. When i click RUN, the process doesn't start. My screen seems to refresh but I don't see anything in terms of activity.

I waited for around 2/3 hours for one of my sites, and still nothing, thinking there was a delay with CRON.

I have reinstalled the plugin, and setup a new job process and still not able to start the process. I have increased the memory to 256MB and still not able to start the job process.

Would someone be able to offer any help?

I have granted access through the WPMU Dashboard on my site isqchina.cn

It's strange why only these two sites are having difficulties, and the remaining 5 work without a hitch.

If you need any further information, please don't hesitate to ask.