What looks like a freeze, may actually only be a long delay caused by a lengthy calculation. YASARA normally uses progress bars to provide visual feedback, but if you are working with extremely large structures containing 100000s of atoms, even simple things can take a long time. Look here for some hints how to improve performance.

• If you are using the Twinset, just switching to a WHAT IF menu can already take a long time (30+ seconds), especially if there are 10000s of water molecules present. Try to remove the objects containing water molecules before using WHAT IF functions.

• If your molecule is not extremely large and you are not using WHAT IF functions, then please contact support@yasara.org, providing the scene that caused the hang.