What are the hashchecker  options? If you run it with /? it runs on a server, instead of showing an help message. So what are the command line entries, or how can we access the help message?
In order to see the error message (help message) you need to run the hashchecker with no argument, as shown below.
C:\Documents and Settings\Administrator>HashChecker.exe
[03/12/2009 10:59:31] Incorrect Arguments
Usage: HashChecker.exe <dataclass guid> -a -e -l -n
-a All Data Classes
-e Send an email with the results
-l Run HashChecker at a lower priority
-n Recreate empty Data Hashes (expensive operation)
So we find there the known -a option, but what is really interesting is that there's a -n which can be costly but should can help reduce database workload during forwarding reception!