I'm not sure if 0.9.3.3 handled that correctly -- the current version is 0.9.4.2, so I'd recommend that you update specifically because 0.9.4 brought a lot of improvements to the Output Filter functionality. There's a page in the wiki: http://code.google.com/p/wordpress-custom-content-type-manager/wiki/OutputFilters including a video. The sample templates in 0.9.4.x are also improved, giving you fuller examples of how to use the output filters.
If you're using the "to_image_array" filter, then it should be returning an array of image attributes, so if that's what your field is using, then the get_custom_field() function would return an array, not the image id... like this:
<?php list($src, $w, $h) = get_custom_field('Bild1');?>
In 0.9.4, you can double-check this or override it by specifying the "raw" filter, and that would give you your image id:
<?php $image_id = get_custom_field('Bild1:raw');?>
But that's only available in 0.9.4. You can check the image id with your uploaded media items... find the image you linked to, and if you edit it, your URL should display the image id, e.g. "123" in the example below:
Also... Your images should be scaled in terms of pixels, not in percentages. A lot of layouts clip the content area so if your image is too large, it gets clipped. This could be what you're experiencing.