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If you're using FCKeditor 2.6, please upgrade to the latest stable version (see #346908: Call to undefined function: fckeditor_iscompatiblebrowser() ).
About 6.x-2.x:
This is a completely new release of FCKeditor. It has not been tested well, so use it at your own risk. It contains lots of cool new features, so you may give it a try and report any errors you find.
Major improvements vs 6.x-1.x:
* powerful method of assigning FCKeditor to textareas (based on paths, ID's and content types)
This release includes bug fixes for serious issues found in rc5.
If upgrading from version 6.x-1.2-1 or earlier, please read release notes for 6.x-1.3-rc2.
If you're using FCKeditor 2.6, please upgrade to the latest stable version (see #346908: Call to undefined function: fckeditor_iscompatiblebrowser() ).
This is probably the last release candidate before a stable release.