Starting with DbVisualizer 10.0.22 there may be a problem to load the bundled JDBC driver for Redshift. Do as follows to fix:

  1. Open Tools->Driver Manager and remove the current jar file for the Redshift driver entry
  2. In the Driver Manager open Driver->JDBC Driver Finder and press Start
  3. That will reload the Redshift driver
  4. Close the Driver Manager and connect your Redshift connections