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Since updating to 3.5.1, I can no longer get single line breaks in the WYSIWYG editor. I used to be able to shift-return for a line break and return for a paragraph break. But now all lines have double spacing. Hitting "delete" at the beginning of the line does not help.

I can of course fix this by switching out of WYSWYG mode, but this makes no sense to me. I tried replacing the WP-ADMIN folder with a fresh copy, no change.

Any ideas?

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A "workaround" that I found which made it work for me today is to add:

define( 'CONCATENATE_SCRIPTS', false );

to the end of wp-config.php

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Please explain why this should work. – kaiser Feb 8 '13 at 19:44
This seems to be a common problem with some old plugins/themes and "recent versions" of Wordpress. For more info, read this: wordpress.org/support/topic/editor-stuck-in-html – J. Chin May 2 '13 at 15:52

On windows, I use ALT + SHIFT + ENTER, for Mac I think that would be OPTION + SHIFT + RETURN

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