Says at launcher upon hitting play: ''Unrecoverable error. Failed to open streaming asset database'', game wont start. Help please.
If you haven't done so already: from the launcher click 'advanced tools', select 'validate game assets', click validate.
In your install folder, rename the "assetcache" folder. Then start your client and see if you can get in. You can then try exiting and renaming it back to see if it will work (so you don't have to re-stream down everything again).