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as you can see above in question2answer.org also. How to overcome?
Q2A version: 1.5.2
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Did you find the solution? I have the same problem on my site as well

2 Answers

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It is the new fb loader image which is loaded during the login button loading process. It is an fb element style with 200px width and 94 px height.

I did not figure out how to change the elemt style but You can add in Your css file to the style:

.qa-nav-user {............height:30px;overflow:hidden;}

That worked for me, play around, may be You need other dimensions.
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It seems that fb was just trying something. I cant see that shifting problem any more on my sites.
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