Mouse hover over to make layer appear not working?

I used triggers to make layers appear throughout a project.  I'm reviewing it and on most of the object triggers (there's 20ish throughout the course), the layer does not appear; it gets "stuck" on the left side of the screen and blinks in and out if I hold my mouse over the object.  Has anyone else had this problem?  

Some additional information:

  • The project is saved on my local drive
  • I created it about a year ago and it didn't have these problems originally; I haven't reviewed it since
  • I deleted the objects and replaced them with new ones; the problem still exists
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