Board Thread:Support Requests - Getting Technical/@comment-25239866-20170816135838/@comment-1757994-20170816154830

Gadgets have problems in wiki farms. The settings are global settings, but the gadgets are local. When you save preferences on a wiki that doesn't have the same gadgets, the setting gets cleared. When you return to the wiki that has the gadget, the setting gets set to the default, which is probably "off."

It's a good reason not to use gadgets on a wiki farm.

Meanwhile, WikiMedia is moving towards them for modularity, which works for their (different) architecture.