hover-state of image is flickering

hi everybody

in my course i placed a picture on top of a tekstbox.
I added a state 'hover' to the picture to make it disappear when the mouse hovers over and make it come back when the mouse leaves. 
In preview the picture doesn't disappear, but starts flashing realy fast.

I tried another way, i added a trigger to the picture;
change state of picture to state hidden when mouse hooverd over picture
this time the picture won't reappear...

I hope somebody knows a trick!

thanks in advance!

Erica 

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