1. With the compiled version 20190410 test, click File - > Save bitmap to report error. See attached file.
2. With version 20190606, after compiling and testing, and clicking the File drop-down menu, the error occur.See attached file.
3. Can you add a progress bar for reading IMAGE files? Every time when open the software and load a larger file, the process takes a little longer. It's better to have a progress bar.
My test environment is: WIN7 x64

Thanks

Thanks for the feedback.

1.) [Windows specific issue with bitmap saves is fixed](https://github.com/rordenlab/MRIcroGL12/...) with latest commit. Please update both MRIcroGL12 and Metal-Demos repositories.
2.) Unable to replicate this issue. Can you test the latest commit. Also, does this issue influence the latest pre-compiled [stable release](https://github.com/rordenlab/MRIcroGL12/...)? Can you provide feedback if this persists and open a Github issue if you can provide any insight.
3.) [I have created a feature request](https://github.com/rordenlab/MRIcroGL12/...) for progress feedback for Windows.

I am afraid that my oldest computer has Windows 8.1. Be aware that support for OpenGL was a bit shaky on older Intel integrated graphics drivers for Windows. Modern graphics cards provide better 3D Texture performance.

1. I downloaded and tested the latest version. There are still some questions about saving bitmap. See the video for details.
Note: To reduce the size of the video, I saved the save bitmap to a fixed location without a save dialog box.

2. Can the Orientation Cube be marked S\I\A\P\L\R on each side?

1.) Change the "Bitmap Zoom" in the preferences to 1 if you want lower resolution bitmaps or your older computer is overwhelmed by the huge bitmaps.

2.) This would be a nice feature. The orientation cube code is completely modular, so you can update the simple cube project to develop this. You could either do this with texture wrapping or by drawing the text as triangles:
  https://github.com/neurolabusc/Metal-Demos/tree/master/cube
You can issue a pull request when you are ready to share your solution with the rest of the community.