The vertical and horizontal sliders are behaving more like the distortion slider.
When sliding left or right they are pulling from the center, rather than the right or left end.
Well, they *are* distortion sliders (sort of), leaving the very center of the photo unchanged. This has not changed from LR3. I can see no bug there. Also keep in mind that the visual effect is very different from wide angle photos to tele photos. Photos made with a tele lens are more or less just changed in the aspect ratio, and not so much distorted like wide angle photos.
Also, with the scale slider....If I scale down it shifts to the right.
This can happen if you used the horizontal slider before, combined with "Constrain Crop" - because the usable part of the photo shifts to one side or another. In the same way, scaling will shift up/down if one used the vertical slider before. This is perfectly normal. Hint: Try the vertical and horizontal sliders independently, with scaling set to 50 (minimum) and "Constrain Crop" *OFF* to see what they do with the photo - that made it a lot clearer to me how they work.
when I reset all the sliders to zero. The image doe not reset to its original position.
Also normal, because if you reset the manual corrections after working with "Constrain Crop" enabled, only the manual corrections themselves are reset, leaving the crop&straighten tool at some "funny" settings. Go to crop&straighten and reset it, too.
In conclusion, I see no bugs here. I also fiddled with the various manual sliders, and could not see any behaviour that was different to LR3, which has no bugs in this respect as far as I know...
P.S. I am not sure if I quoted the last question correctly or not. I assume these two sentences belong together?
Yes, same behaviour as soon as I get this "problematic" image in D module. To avoid this, I reset adjustments in Library and then retry the entire process in Development module, but in another way. This seems to work but I don't know where the crash is coming from ?
I never had it with LR3 (of course on same system, MAC OSX 10.7.3).
I'd like some clarification from Adobe as to whether they've actually changed the way the transforms are done as LR4 seems to be much more aggressive with the transformation from LR3. I have seen a noticeable difference, especiallly when I push the vertical transformation much above 10 points, then it really begins to over distort.
I've wondered if LR3, the transformation was not only keystoning the image, but also a little stretching to prevent a building from getting too squashed or stretched with larger values for Vertical transformation.
LR4 seems to work from the middle point and makes the changes differently.
I've also crashed LR4 wby accidently hitting the scale slider - very irritating as I never use scaling