Thanks for the reply, PaulSo you are telling me that this could be a known bug in versions prior to 2.24?In this case there is a problem. The application is actually a GIMP plugin and it must be compatible with a wide set of GTK versions. For example, the latest branch of GIMP 2.8.x for Windows still depends on GTK+ 2.16 / 2.22.Does it mean that the problem won’t be solved for such environment unless someone will upgrade the dependency to > GTK 2.24? Am I right? Other solutions?Also, is there a bug report opened for this issue somewhere?