In Illustrator CC (Latest version and several previous) on Mac:
- BUG 1: Copying text with a Paragraph and/or Character Style applied and pasting it into a new text box adds a "+" to the end of every applied style, effectively breaking every bit of formatting that has been done. (Every style must be reapplied to the text to make the text update when the Styles are updated).

• BUG 2: When Staggered margins are set while editing the Style Sheet (e.g. a 20px Left indent and a -10px First Line indent), clicking on the "Tabs" tab, wipes out all newly set indents. The only way to keep the indents, is to first close the Style Sheet, and then re-open it and then edit the Tabs.

• BUG 3: (ties into BUG 1) Any Style with a "+" added to it indicates that alterations have been made to the text outside of the Style. But, updates to the Style that don't affect the altered setting aren't applied to the text. This mean's that any styling to the text outside of the Style effectively breaks the entire link to the style. This 'should' function as Style sheets do in InDesign... keeping the link to the Style and treating the adjustment to the text as a manual override to just the adjust aspect (such as changing the text to a different color than used in the Style). What's the point in applying a style (beyond formatting text) if any alteration to the text breaks the Style?

I've been using Illustrator since it was a version 1.x application and the last few versions have been very ******* Style Sheets (bugs and poor implementation). Please fix current bugs first, rather than adding more new features!