The OpenAFS Client Service and related binaries distributed by OpenAFS.org are digitally signed by "Secure Endpoints Inc.".  The OpenAFS Client Service will perform a run-time verification check to ensure that all OpenAFS related DLLs loaded by the service match the same file version number and were signed by the same entity.  This check has been added to prevent the stability problems caused by more than one AFS installation present on a machine at the same time.  Many hours of support time have been wasted tracking down problems caused by the mixture of files from different releases. 

Appendix A documents the " VerifyServiceSignature" registry value which can be used to disable the signature check.  The file version check cannot be disabled.