Cheryl Cole's Accent -- Too Thick for 'X-Factor'

5/25/2011 4:20 PM PDTby TMZ Staff Cheryl Cole was dropped from the judging panel on "X-Factor" largely because producers were  concerned her English accent would be too difficult for an American audience to understand ... sources close to the production tell TMZ. .There were other issues too -- we're told Cheryl and fellow judge Paula Abdul had a "lack of chemistry" ... and Cheryl was more expendable.Producers now want Cheryl to return to the UK version of the show -- but according to sources, Cheryl's royally pissed over how this situation was handled ... and may sever ties with "X-Factor" entirely.Steve Jones will now be the only host on the show -- which debuts in September -- since Nicole Scherzinger will be filling Cheryl's seat on the judging panel.Calls to Simon Cowell still haven't been returned.