I know that very few customers use the Dexterity Process Server (or Distributed Process Server?) (let's just call it DPS), but I thought I would document this in case some other lucky person runs into this issue.
When I launch DPS.exe and open a Dynamics.set file, I get the message "Error initializing Process Server".
DPS then crashes with this "BEX" error.
I tried rebooting the server, but no luck.
After scratching my head for several minutes, I was almost ready to give up and try reinstalling GP when I thought of one last thing.
The server I was using has User Account Control (UAC) enabled at the default value. So I tried launching DPS.exe using Run As Administrator.
Fortunately, that resolved the error!
I have seen so many strange errors and unexplained symptoms that were ultimately resolved by using Run As Administrator or disabling User Account Control.
While I understand the concept of UAC, the implementation and side effects are far from ideal.