Package: x2goclient
Version: 4.0.3.0

Running an eclipse-rcp application that uses tooltips (swt). Tooltip 
flash alternately with a black square
The problem occurs when using the x2go "single application" session 
type, it doesn't happen on full desktop

client: windows only (apparently)
server: fedora 20 3.15.10-201.fc20.ppc64p7 xfce