OK, but this line that you quote means nothing to me at all. You need to explain what is happening/not happening.
I am not familiar at all with the 'hapax' device.
I'm not at all sure that there is a 'bug'.
I assume that you are in one project. You try to 'load a new project'. Is this an existing project, or are you creating a new project. I guess that you would normally click on an option to do this, is the option present, and does not work, or is the option disabled? If it does not work, is there any sort of error message? What actually happens? If this relates to an existing project that you need to add to the project already open, I assume that the 'new' project exists in a file, does the system find the file, does it seem to be searching for the file, does it find the file but there is something wrong with it (it thinks)? Is it the same extra project that you have a problem with, or is it the same already active project that always has problems loading (adding) ANY extra project?
If one of the files you've already posted has problems loading extra projects, which one? If one of the files you've posted will not load as an extra project, which one?
This is another thing entirely, maybe - but your last note refers to 'instability' with the USB midi. What sort of instability? USB midi can have problems with timing/latency, but this is nothing to do with midi per se, it is to do with the OS and the way things are set up and all the other tasks that the computer may be trying to do at the same time.