Opening User Config Fails on macOS

# Steps to Reproduce the Problem

1. Open HDFView
2. Select “Tools” → “User Options” in the menu bar

# Expected Result

A window shows up displaying the GUI for the user config. The screenshot below shows this window for HDFView `3.2.0`:

# Actual Result

HDFView (`3.3.0`) displays an error message about **invalid values**:

# Things I Tried

Getting rid of the files:

- `~/.hdfview3.3.0`
- `~/Preferences/HDFView.hdfgroup.org.plist`
- `~/Library/Saved Application State/hdf.view.savedState`

did not solve my problem.

Opening the user configuration in HDFView `3.2.0` works without any problems (as far as I can tell).

# System

OS: macOS `13.4`
HDFView Version: `3.3.0`