File Upload doesn't allow deleting anymore.

Hi all,
My community under 2.0.18.14 and a customized version (by your inputs here) runs into a problem, when deleting uploaded images.
This is the error users get in a popup, when they try to delete an uploaded image.
Attempted to set invalid DeliveryType value (JSON). LOCATION: /www/htdocs/w00ccea7/library/core/class.controller.php 615: if (defined('DELIVERY_TYPE_'.$Default)) { 616: $this->_DeliveryType = $Default; 617: } 618: else { 619: throw new Exception(sprintf(T('Attempted to set invalid DeliveryType value (%s).'), $Default)); 620: } 621: } 622: 623: return $this->_DeliveryType; BACKTRACE: [/www/htdocs/w00ccea7/library/core/class.dispatcher.php 295] Gdn_Controller->DeliveryType(); [/www/htdocs/w00ccea7/index.php 53] Gdn_Dispatcher->Dispatch();
Anyone has an idea on this?
Thanx a lot for help,
phreak
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Yes, that came up recently with a security fix that was backported:
http://vanillaforums.org/discussion/comment/216330/#Comment_216330
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Thanx a lot @Bleistivt. Problem solved!
Tipp for others: Also clean THE FILES in your vanilla cache folder. Some of my users didn't experience the fix as long as this wasn't made.