On linux, the following warning is printed in terminal:
X_ChangeProperty: BadValue (integer parameter out of range for operation) 0x0
FLTK STR 2419 should have fixed, but this problem still affects KISS Player. In the STR, this warning is printed for cut & paste operations, but for KISS Player just opening the program is cause for the warning.
Archlinux x64 and Xfce 4.10.