Hi,
This morning, I observed that Tizen SDK 2.3.1 was freezed when it's launched while loading org.tizen.common.
Creating new workspace which was guided in below links was not valid for my case.
http://spacetech.dk/eclipse-failed-java-was-started-but-returned-exit-code-805306369.html
http://stackoverflow.com/questions/10157794/java-was-started-but-returned-exit-code-805306369
But I could resolve this issue by below command to remove class cache of jvm. Then, after rebooted my pc, SDK could works without problem.
javaw -Xshareclasses:destroyAll