Your error screen just shows you are receiving a 500 Internal Server error. You need to see the logs or display errors to the screen to see what the error is. It can be a theme or plugin conflict, or it can be due to running out of RAM. Either of those errors will show up in the log. The white screen and error message from the browser is just telling you there was a problem. We need to know what the problem is.
It's not really weird that it worked with an older version. The plugin has grown larger since that ancient version, and it has more functionality now. It could be taxing the resources on your server, or there can be a plugin conflict which needs to be resolved.
Please be sure you are running the latest WordPress as well. I can't tell from the source of the page which version you are running (maybe it's already 3.4.2?)
Posted 7 years ago on Saturday September 15, 2012 | Permalink