I am unable to add new map grids. After clicking Save, the changes are lost.

This may happen in some circumstances, and the error is related to file system security.

You can try the following to fix this problem:

• Make sure the "C:\ProgramData\Hydromagic\" folder is accessible (read and write access !) for the current user;
• Reinstall the software as Administrator;
• Run the software as Administrator;

If none of the above work, please contact support.