I'm sorry but due to a lack of testing in the development of the version 1.2.1, a major discrepancy has been introduced in the tool interface of the MADCAT and it wasn't detected before release.
The MADCAT crashes anytime you start an action of a tool.
Today, I've released the version 1.2.2. This version corrects this major bug and is the recommended version.
Really sorry for the inconvenience.
See you