@jellytriangle IE10 is supported as well, but Chrome's internal spellchecker/use of spellcheck attribute is buggy.
13 July 2012
JCE 2.2.3 released
This update includes fixes a few issues with the new drag & drop upload, disabling file drag & drop if no supported plugins (Image Manager) are loaded, while still allowing text selections to be dragged into the editor window.
In addition to this, Link Browser Content and WebLinks issues in Joomla! 1.6 have been fixed.
Check out the Changelog for a full list of bug fixes and updates.
Installation and Updating
Updating to JCE 2.2.3 from existing JCE 2.x versions can be done using the JCE Updater, or the Joomla! Update Manager in Joomla! 2.5. Alternatively, follow the Installation Instructions for a new install or update.