Ok, I see the error - it's the same problem in both cases DMrabs and Tabarkus, and it seems to be unique to FGU. Here are the errors:
Handler error: [string "scripts/manager_action_attack.lua"]:403: attempt to concatenate field '?' (a table value)
Script execution error: [string "scripts/manager_actions2.lua"]:11: attempt to concatenate field '?' (a table value)
In both cases, they point to this line of code:
rRoll.sDesc = rRoll.sDesc .. " (" .. rRoll.aDice[1] .. ")";
...which simply appends the string value of the first die rolled to the chat message. I suspect this is probably a widespread error, since this line of code exists anywhere the die value is displayed in the chat message. Interestingly, this line of code has not changed since before DCC became an officially-supported ruleset, so I suspect this is a Unity conflict and not a bug with the latest updates for DCC. Regardless, I will get it fixed.
Thanks for the bug report...

