Hi there, since the problem is still present in the latest codebase, I started to debug this behaviour (Win10 1703, VC2015, Qt5.9) and have seen the problem is not any specific drive problem, but one from the GUI. It occurs whenever a drive cannot be read successful by checkDriveType() or following GetDisksProperty() in disk.cpp. There an error is generated and should be shown in a QMessageBox. The problem is, that the call "MainWindow::getInstance()" (line 339,359 and 450) which defines the parent...