This has happened to me on a few other servers and it appears it's happening to a few people on this one too. The reason behind it happening is mainly because Java 9 doesn't seem to support right clicking. This isn't the case though, all it depends on which JDK the owner has used to program the server in. So what you want to do is Reinstall Java and install version 8. You can re-download Java over at www.oracle.com This has been tested by one of our new members and worked, so If anyone runs into problems, PM me or comment below.