[TYPO3] setfixed error using news_feedit / mthfeedit

[Stefan Kaufmann]

Hello Community,

Every time I want to delete/approve a new entry created with the 
news_feedit extension, I get the following error:

Setfixed failed!
May happen if you click the setfixed link a second time (if the record 
has changed since the setfixed link was generated this error will happen!)

Is anyone out there with a tip how to solve this? I did not click twice 
nor has the record changed....

Any hint much appreciated. Cheers
Stefan Kaufmann