What is the issue exactly?
We dumped 8000 transactions in one block for stress test.
Many validator were unable to handle such load. The network had trouble with propagating the block within 10 seconds, and thus got stuck.
RC2 will be released on Saturday to address issue!
Its not juts a great test but this show that we have a great dev that really works on the project and ensuring that you have the best software that can be used by a lot of people.