"Screen sharpening" option problem

I have a problem with the "Screen sharpening" option after the upgrade from version 1.5.4.1553 to 1.5.5.1599.
When using "Screen sharpening" in version 1.5.5.1599, the image is distorted by color and the contour shifted.
In the old version 1.5.4.1553, there is no problem, the problem arises in 1.5.5 (1599, 1597, 1596).
Example:

 
How can this be addressed?
Thanks!

Please upgrade to FRV 1.5.6 release candidate, it fixes that problem: https://www.fastrawviewer.com/blog/fastrawviewer-1-5-6-ReleaseCandidate

Thanks, problem solved!

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