All official versions of Karamba3D get thoroughly tested before release. Since Karamba3D consists of many thousand lines of code chances are high that it contains undiscovered bugs.
As soon as we get aware of problems and errors they get published in the release notes.
The Karamba3D releases carry a version and a build number. The first two digits of the build number signify the year, the next two digits the month and the last two digits the day when the build was compiled.