CASIO401::EnterInitialized() checks that the driver is initialized before handling a driver method call. The problem is, if the check fails, EnterInitialized() throws a C++ exception (without a catch) instead of returning an ASIO error code. This will likely crash the entire host process.

This bug was discovered when troubleshooting an issue with the HpW Works software. In practice it's benign because the crash can only occur if an application is misusing the driver, which should not happen in the first place.