Hey guys, I found the problem!, it's related to libstdc++5 version 1:3.3.4-5, it works fine with libstdc++5 version 1:3.3.4-3. The problem is related to Sid only. In Sarge it works fine (since libstdc++5 is the correct version). I'm not a programmer, so I can't help further, someone should find the cause of the bug and file the correct bug report to libstdc++5. Thanks for your help.