[evince] what does this icon mean?

[George <gheine mathnmaps com>]

Sometimes when running the document viewer, get an icon that I don't
understand.  It appears to be a piece of text with a hand and a plus
sign in the upper left corner.  I posted a picture of it at
http://www.mathnmaps.com/evicon.png .

When the icon displays, screen appears to lock up for several seconds
up to a minute.  What is going on ?

Thank you for your help!