In a jsp template, including the following tag (assuming that cmsu is the prefix assigned to the cms-util taglib...):

<cmsu:txt2img imageContentNodeName="generatedImages" text="Snowmobile Vermont!" />

should create a JCR child node of the page called "generatedImages" and put a node under that node containing the generated image.

An error is thrown.

Instead of doing this, however, a RepositoryException is thrown (full stacktrace in attachment)

Another user on the magnolia-users list confirmed that this error occurred on his system as well.