If you restored your database back to the way it was before the changes, run these queries to restore your functionality as well:
Code:
update loottable_entries set mindrop = multiplier, droplimit = multiplier, multiplier = 1 where probability = 100;
update loottable_entries set droplimit = 1 where probability != 100;
This will remove multiplier for tables that have a 100% probability (since mindrop/droplimit can now handle that, although you can still use multiplier if you wish using droplimit) and it forces all other lootdrops to only drop 1 item at a time max (unless a multiplier is set, of course) which duplicates the behavior of the old system. Chance and probability no longer needs to be changed since probability is back.
The difference is in the old system, a lootdrop could only drop a single item unless a multiplier was set, but that still was determined by probability. Now in the new system, we can control exactly how many items will or could drop per lootdrop and it can be as many or as few as you need.