I recently did a clean wipe of my laptop and reinstalled everything and Haven seemed to work fine last night.
I was prompted to update JRE to 7u25 by Avast before I went to sleep so I did. Now I find that if I try to open/run the "run" icon for Haven (under Union client, Enders or vanilla client) it simply won't work. A small DOS window pops up briefly as if it is beginning to load but that's all.
Any ideas what's wrong? Should I/can I roll back the Java update?

Thanks everyone!
J