I'm on Ubuntu 15.10, and I have the same problem with MIOS Studio 2.4.6. After trying to load a hex file, the path selection box says: /home/jjonas/Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged. /home/jjonas/Desktop/midibox/MBSEQv4/midibox_seq_v4_091_pre3/MBHP_CORE_STM32F4/project.hex If you erase the top row and press enter, the hex loads (and uploads) ok. What wasn't mentioned in this thread yet is that MIOS Studio 2.4.0 works ok. Just though to