Why do addons randomly attach to various Scrapebox Instances?

Edit: This is an old entry.  Im leaving here for reference sake but this was tweaked prior to V 1.16.0 coming out.  Addons now attach to the instances they are launched from.

Scrapebox addons are stand alone applications.  They use Inter Process Communication (IPC) to communicate with the scrapebox.exe process.  Inter Process Communication is not multi process aware, so when you launch an addon windows will scan the process list and it attaches the addon to the first scrapebox instance that it finds.

This is why if you have multiple instances of scrapebox running and you launch an addon it won't always import urls or proxies from the instance that you launched it from.  This is a limitation of IPC.