I am using Pentaho OpenSource-installer.exe (version 1.8) and I am making a report with the reportdesigner included 1.7 build 479 on a D-ISAM DB using Transoft JDBC driver.

This is working well but after previewing the report a few times no data was presented anymore. The error was that the maximum number of licences (4) was reached.

The problem was with the preview-windows in the reportdesigner and then closing the preview-window using the X in the right upper-corner. The JDBC connection is not closed then.
When I close the preview-window using the menu Report > Close the JDBC connection is closed.

I do not know if this is by design or if it is an error and I should make a report about it. Thanks for any advice about that.