I had some serious troubles. Customers in my multi-site install could not login anymore; they got a blank page.
After a whole day of investigating I discovered that the Slimbox2 plugin (this one) caused it.
I switched it off and problems are over. Pfffff....
Sick and tired of this plugin, I'd like another plugin that gives a nice lightbox effect.
Hope that there are a few positive experiences here that people wanna share...
Thx and cheers!!