Cannot use stdclass

# id=(“|)(\d+)\1#i
Fatal error: Cannot use object of type stdClass as array in D:\server\xampp\htdocs\wordpress2\wp-includes\functions-post.php on line 382

I get that error when i try to publish locally on a xampp install using php5.0 and winxp when i drag and drop images. (entries without images are fine)

A brief search showed that this problem occurred with php 5 long ago, but wp later had no problems with php5. So uh. any suggestions?

using 2.0 beta 2.