Hi Sebastian, I have been narrowing down the problems with the serialization and while I haven't yet spotted the bug yet it does like the the serialization of the VertexAttribArrayList is broken. In your original files that list there as being 8 arrays, but only two are listed.
If I change the number of arrays listed in the .osgt to via "VertexAttribArrayList 2 {" then the file parses without error. I don't see anything on screen but it does at least load. If I remove the VertexAttribArrayList entry completely then the file loads and displays the sign just fine. My next step will be to have a look at the serializers for VertexAttribArrayList to see what might be going amiss. If you've have any spotted anything else useful let me know. Robert
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