I am really sorry.
I thought the problem was the upgrade to Slackware 11, but i visited DVDStyler site and the problem is related to a version of wxSVG needed by DVDSTyler.
I also have a problem when i run dvdstyler:
Fatal Error: Mismatch between the program and library build versions detected.
The library used 2.6 (no debug,ANSI,compiler with C++ ABI 102,wx containers,compatible with 2.4),
and your program used 2.6 (no debug,ANSI,compiler with C++ ABI 1002,wx containers,compatible with 2.4).