[Therion] Bug with "copyright" symbol ?

Hello I'm using a redefined legend and within this there is a line: ...{\size[\thsizem]\si\the\cartotitle: \ss\the\cartoteam\quad\size[\thsizem]{\copyright\thinspace\si\the\cartodate\par}}... The variable \thsizem is defined within the layout: ... code-tex ... \def\thsizem{36} ... endcode ... The output is like this: As you can see the circle around the letter "c" is not correct and is not changed in size as the letter itself. Does anyone have a solution to correct this? Thanks in advance, Torsten