How to find out which context reaction is firing?
About a year ago I was working on a project where the breakpoints module would periodically send us into refresh loops.  I don't remember the particulars - only that the issue was due to the cookies not being cleared properly.

Breakpoints relies heavily on cookies to determine which display to use and when the cookies aren't cleared the module receives somewhat mixed messages.  I use Chrome for my development and found the extension Edit This Cookie very helpful.