@Richard - Looks like there may be an issue with the script " (1116) INV_Commit/Uncommit_Inventory_Changes" in the current release. The loop exits right at the beginning since the portal is not found.
Adding a script step "Got to Object [Object Name: "Invoice Portal"] " in the beginning of the loop allows the "Go to Portal" script step proceed since it is found (no 101 error) and execute the loop steps.
Environment: FM Pro Advanced 13.05 Mac / FMS 13.05 Mac
FMSP: 4.3v1