Joomla 1.5: try latest nightly builds... not RC2. See our article on RC2...
1. There is a fix in this forum for this, please search.
2. Thanks for reporting, we will try to reproduce
3. CB language file: search forum
4. Same 1.5 RC2 problem.
Thanks for trying with latest nightly build (
dev.joomla.org ) and reporting back here if your problems are solved.