When i have imaging 0.24.2 installed with Lazarus from svn under gtk the display of png files is wrong (As example the images in component palete of the ide are messed).
If i comment the RegisterTypes call in ImagingComponents unit the problem is gone.
I'll look into it when I have some time, thanks for letting me know.
This error is finally fixed (actually for some months now, the cause was same as for garbled images in Mac OS).