Publishing snapshots

I am using Grafana 4.4.3 with MySQL data source on Linux Mint. When trying to publish a snapshot to, I’m getting “Unexpected error”, which isn’t very helpful. Any ideas what the problem is and how to fix it? I’ve tried increasing the timeout to 60 sec. but that doesn’t solve the problem.

Any ideas? Is anyone else experiencing this error? Are snapshot publishing to that site no longer supported?

Similar issue here.
When I try to publish to, it kinda works for small timeouts, but the larger I specify the timeout, the less likely it seems to work.
So, it basically works for dashboards with only a few data, but not for “more complex” dashboards.