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My displacement filter is simply broken. I made the simplest possible grid for a test subject, and then a displacement filter which is solid 50% grey. This should, as a displacement map, do absolutely nothing. But when I apply it, it produces the transformation shown below. It's moving the lines around, fading then, and it also adds horrible pixelation in the middle. This from a map that should have no effect at all! What's causing this and what can I do about it? Thanks.

Test Pattern Test Pattern Displaced

Update: Here's a PNG of the displacement map, as requested (sorry it's so boring, but I did say it was a totally neutral map):

enter image description here

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Have you tried resetting preferences/settings? – Scott Feb 5 at 22:33
Could you upload a PNG of the displacement map? – Lèse majesté Feb 6 at 1:58
@Lèsemajesté: Yes, I've updated the question with a PNG of the map. – Joshua Frank Feb 7 at 1:26
@Scott: I just tried it now and the same thing happens. – Joshua Frank Feb 7 at 1:29
Who made the down vote, and why? – Joshua Frank Feb 7 at 1:53
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when I take your grid, and then create a 2-channel displacement map, I can mimic your problem using the following:

(-50,-50,tile,wrap around)

Channel 1, Channel 2: (The filter image looks plain grey, even when exporting)

enter image description here enter image description here

Final image:

enter image description here

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