I have had this happen a couple of times now in the last week or so. I click Test on upper right hand corner. Screen sticks on saving and never saves. This is a real bummer after you have done a bunch of work 
I am using chrome version Version 28.0.1500.95 m
Hello! Sorry about that... Did you notice any steps we can use to reproduce it?
sorry-I don't remember. made a lot of changes to scripts as I was copy-pasting from one app to other. I do not know if this would help, but it would be nice to cancel a save when it sticks, to try to save again via save button instead. You cannot 'X' stop load with browser in this state
We're really sorry you have experienced this issue. For now please try to use "Save" button. As you might know already we are planning an update tomorrow. Hope there won't be this problem again. Please let us know otherwise.
Hi
FYI- just had it happen again. I had previously cleared all cache etc, then closed browser. While in editor I mapped some rest service values and before that added some request parameters to an existing service.
I saved before Test and Test hangs and never finishes.
I noticed that my last attempt (generating this original post) appeared to have saved my changes. Last week when it happen they were not saved.
[quote:]Last week when it happen they were not saved.[/quote] perhaps you didn't click Save button. There is nothing we can do now unfortunately... Let's see if this reproducible after tomorrow release. For now please use Save button before testing.