gEDA-user: Little problem with old schematic in new gschem

[Xtian Xultz]

I loaded a little old schematic file in the latest gschem release. Works fine, 
but some characters appears as '?', and on the log screen appears messages 
like:
Could not find character ' ' definition.
Could not find character '?' definition.
Could not find character '$' definition.
Could not find character ':' definition.
Could not find character '.' definition.
Could not find character '/' definition.
Am I doing something wrong? In what file these definition resides? How can I 
avoid this?