in the Navigation-Panel on the left, when you expand a package, it is no longer possible, to double-click on a function/procedure and jump directly to this function/procedure.
Now you always start at the beginning of the package.
This makes ist very hard, to quickly jump to a function in a bigger package.
Hoepfully this gets fixed before the release.
This issue has been previously reported https://forums.oracle.com/message/11105116#11105116
bugged and fixed.