Running filezilla in a terminal gives the following error:
Fatal Error: Mismatch between the program and library build versions detected.
The library used 3.0 (wchar_t,compiler with C** ABI 1011,wx containers,compatible with 2.8),
and your program used 3.0 (wchar_t,compiler with C** ABI 1010,wx containers,compatible with 2.8).
Aborted
Solution is compile the packages from source:
FEATURES="-getbinpkg" emerge -av filezilla libfilezilla wxGTK