Too much recursion

After uploading an image with imagefield_cop I get a Javascript error "too much recursion" in misc/jquery.js?P line 13.

The "cropped" imagepreview and the complete image are drawn, but no crop-controls.

My config:
Drupal 6.12
Ajax 6.x-1.14
Content Construction Kit (CCK) 6.x-2.4
Date 6.x-2.2
Email Field 6.x-1.2
Embedded Media Field 6.x-1.2
FileField 6.x-3.1
Image 6.x-1.0-alpha5
ImageAPI 6.x-1.6
ImageCache 6.x-2.0-beta9
ImageField 6.x-3.1
Imagefield Crop 6.x-1.0-beta3
jQuery UI 6.x-1.3
Organic groups 6.x-1.3
Prepopulate 6.x-1.1
SpamSpan filter 6.x-1.3
Thickbox 6.x-1.2
Transliteration 6.x-2.1
Views 6.x-2.6