Hello, i dont know if it happend because of the recent fp update, but the plugin doesnt seem to work when i set "/stackall" to 2000 or any other number, is the plugin outdated? 

/Stackall is working fine for me have you made sure the permissions are set ?

Well for one thing you cannot "stack all" as there are many items such as bear (snap) traps, Riot helmet, most weapons.chests,ceiling lights etc that will only stack 1 which is the default ,
You have to go through the list and set the stack limits which is time consuming but necessary then reload the plugin,
Anything that is set higher than the "set" default will show as an error and that it is being reset to 1, the rest will work ok