Some custom labels produce the basic shapes instead of the desired label.

[yewang]

The custom labels "circle", "square", "triangle", and "ex" (cross) produce the corresponding basic shape markup instead of a label with the given string.

Uploading the SGF file string "(;LB[aa:ex])" places a cross in the upper left, and subsequently downloading the SGF still returns "(;LB[aa:ex])".