I have installed the latest DEV release with CKEDITOR. All buttons are placed in one line instead of multiple lines. How can this be solved?
This is discussed in #277954: Allow to sort editor buttons, and worked on in the sort_buttons git branch. I'm just about to push a lot of code there now an post a new patch for the changes in there compared to 7.x-2.x. (No upgrade path yet!)
If you do not wish to patch the module, there's discussions and code examples for a less invasive workaround, by means of creating another small Drupal module to alter the settings, in #829266: Fixing toolbar for the CKeditor / Using the settings hook.
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