To use the new feature of lazy singletons , Studio Client uses a new version of Jangaroo. Support for lazy singletons has been added to the run-time (in jangaroo-libs 4.0.52), which is fully compatible. The compiler (in jangaroo-tools 4.0.72) supports the new annotation Lazy , which is also not a breaking change. For details, see JOO-152 . Note that the update also contains a number of fixes and improvements regarding type-checking, which may reveal type errors in ActionScript/MXML code. So in the unlikely case that after the update, you encounter compile errors in Studio Client, please consult the above issues to fix those type errors in your code.

(CMS-18179)