Details
Description
Any exception thrown in the UI code is not logged nor shown in the UI, only the exception message appears, making it almost impossible to debug (a user reported a "java.lang.NullpointerException" while doing a preview, and that's all the information he got). We need at least a stack trace, it may be ugly, but it's at least useful.
Fixed in 1.6.x, 1.7.x and trunk