Datastax DevCenter fails to start

DevCenter 1.5.0 won't start, even though it was working a few days ago. I have already tried as suggested by the answer to this question : Datastax Devcenter 1.1 fail to start

However it didn't work for me. It did lead me to think it might be due to having updated to Eclipse Mars Yesterday, perhaps?

Any ideas would be great. Thanks in advance.

In response to the comments below I am running windows 7. Also I just realised that even though my JAVA_HOME is set correctly I am gettng this error when I run java -version:

Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.

C:\Users\username>java -version
Error occurred during initialization of VM
java/lang/NoClassDefFoundError: java/lang/Object

Update : I fixed the java -version issue above by removing java.exe from C:/Windows/System32/ . But DevCenter is still not working.

OS: Windows 10 Pro Dev Center - 1.6.0 (downloaded as zip. to run, we need to unzip and it's ready to go)

Today I faced a similar problem and was able to resolve by deleting/uninstalling the current Dev Center and re-installing. When you delete manually, make sure you delete the .devcenter folder. You will then have to reconfigure the connection(s) that you were using.

-Regards