When I click preview.Then click layout.!
It can't show! amazing!!!
But when I refresh page It show now.!!
Can you provide a bit more context?
What version of RIB (Preview 1, Preview 2, git master HEAD, some other git commit)?
What browser and version?
What does the app design have in it?
Best way for me to test is if you can export the project/design and send it to us, either the .zip or just the .json file.
RIB is online version.
browser is chrome :15.0.874.106
Hmm, that's a rather old version of Chrome these days. Oldest one I've used with this version of RIB is Chrome 18.*. I recommend updating to a newer version and trying again.