SQL Developer (Raptor) build 220.127.116.11.98 (using JDK1.5.0_06) for Windows platform.
Every time i try to save a package source using the context menu Export DDL/Save to file, SQL Developer hangs (but if i choose Save to Clipboard it works).
I don't know if this applies to other object types as well.
I tried using the built-in Check Updates feature but for some reason no available upgrade was reported, however, after visiting the download page, i realized that a newer version was available indeed (18.104.22.168.13) and, after installing it, the problem is gone.
Interestingly enough there is no such bug entry in the fixed bugs list, so i wonder if this is a machine configuration dependent bug.
Last but not least, let me praise the upgrade mechanism of SQLDeveloper: unpack the zip file on top of the existing folder and you're done.
Just to let you know.