re:
> With this new beta, when I right click to orbit (about half the time) it opens up a file open
> dialog when I release the right mouse button. Any ideas?
Are you doing a right click to orbit but then releasing the button without any movement?
When you right click in a viewport like that it's a shortcut for pushing the "Done" button or if you are not currently in a command it will repeat the last used command. If you have just opened a file then the last used command is Open.
If you don't want the Open command to repeat like that there is a setting in moi.ini you can use. Go to Options > General > "Edit .ini file" button and in the [Commands] section there is a setting NonRepeatingCommands, add open to it so it looks like this:
