The text and the models of about twenty teaching units have been revised, particularly related to the "States of Matter" (Experiments 1 and 45), "Ionic Bonding" (Experiment 14), and "Lone Pairs/VSEPR Theory" (Experiments 19-21).

A new 15-page section in the Molecular Stockroom presents orbitals for a number of atoms and basic molecules. As frequently requested, multiple orbitals can now easily be shown at the same time.

Several other models have been added to the Stockroom, and the parameters of some existing models have been refined.

The "Model Kit" link on the ODYSSEY start page now opens to an HTML-formatted page that gives access to the individual build panels as well as to the 15 units of the user tutorial.

In the Preferences panel, it can now be declared whether dipoles should be visualized with the tip at the negative charge end (the convention of many introductory textbooks and also of Wavefunction's program SPARTAN) or at the positive charge end (IUPAC rules).

Hydrogen bonds extending across the boundaries of periodically replicated cells are now drawn even when "periodic boundary clipping" is turned off.

For some of the experiments that include samples of different sizes (for example, a gas and a liquid), the samples are now initially shown on the same absolute scale. The scale is such that the largest of the samples appears screen-filling, i.e., the user has to zoom in to show any of the smaller samples screen-filling. While requiring additional user action, this approach should eliminate any misconceptions about size differences between different samples.

By default, molecular models are now shown without "periodic boundary clipping", i.e., molecules that fall on one of the boundaries of the simulation cell are shown are shown with all their atoms either on one side or the other side.

Several property names have changed, for example, "Energy (from QM)" is now "Energy (Quantum Theory)".

Also, the "Fast Rotate" option in the Preferences dialog has been renamed as "Reduced Graphics for Slower Machines".

Histograms for the molecular speeds and the molecular kinetic energies continue to be autoscaled when initially generated, but are then kept static even when the system conditions change. Because further autoscaling has been suppressed, changing the temperature will now show an immediate effect on the peak position of the speed histogram (Maxwell-Boltzmann distribution).

ODYSSEY is now available in Spanish. The translation extends to all parts of the program (experiments, stockroom, builder tutorial, compound names, entire user interface, installer utility, user manual).

ODYSSEY now recognizes the number formatting of the Windows operating system ("Regional and Language Options" in Control Panel). The user interface as well as all HTML content is affected by the chosen setting. (The WORD- and PDF-formatted worksheets and the manual always use a "point" as the decimal symbol.)

Now more closely matching the interface of the Macintosh version of ODYSSEY, the build panels in the Windows version have been reformatted. They now display in a manner that is compatible with widescreen and/or high-resolution monitors.

This is the first release of ODYSSEY that will fully run with the new Macintosh web browser Safari 3.0. This browser is included with the most recent release of "Tiger" (OS X 10.4.11) as well as with "Leopard" (OS X 10.5).

Similar to the Windows version of ODYSSEY, the Preferences panel of the Macintosh version now offers a choice regarding the quality of the graphics (~ "smoothness" of the drawn spheres) while a simulation is in progress: