It is common when users experience unusual problems, they come to PMDG for solutions. It is also common that we wind up finding the problem exists outside of PMDG software. We believe this to be the case with a currently reported rash of stachkash errors that some users are experiencing. Please check for the following:
If you are running beta software that runs any time your sim is running, such as a weather program, please revert back to the latest stable, non-beta version. (Side note: if this fixes the issue, it would be kind to pass that information on to the developer of that beta software!)
If you are running any virtual airline programs that track your progress in the simulator, please check with your virtual airline to see the program's compatibility with the operating system you are using. In some cases, this can be fixed by running it in compatibility mode.