Tricky one to add a title for but if I am resizing an object precisely using the W Value and H Value fields, for some reason the size I enter then changes. So, for example, I have an object that is 57.15mm wide. I then change that value to 57mm but when I click return it then changes back to the 57.15mm value. This appears for all other values. So if I change it to 60mm it then changes it to 59.972 mm
Not really sure what setting I have that's making it do this. My document is set up in mm.
Any ideas or help would be greatly appreciated.
I am afraid you are haunted by the Align to Pixel Grid ghost.
You can select everything, then in the Transform panel untick Align to Pixel Grid and in the Options (through the flyout) untick Align New Objects to Pixel Grid. The former will rid you of it for present objects, the latter for future ones.
You may also avoid the types of documents that have it as default (RGB documents (primarily) meant for web and similar (screen) uses), or change the default for such documents.
Now this is strange, because 57.15mm = 162pt = 162px and 59.97 mm = 170pt = 170px, so it has something to do with aligning/snapping to whole points/pixels.
What happens if you select only the offending object and then look at the Align to Pixel Grid setting in the Transform panel?
And what happens if you untick View>Snap to Grid (if ticked)?
Really strange. All options are unchecked on everything you've said. I've also tried creating a new document and pasting that object there and changing the size but the same thing happens. Now, what I've just tried doing is creating a new filled rectangle at 57x57 and that appears to stick to that size!
Strange ideed, greencode.
In such a case the Align to Pixel Grid may haunt the object into new documents, but it should show when the object is selected.
So it seems that it is really a ghost here.
It may be far out, but you may try to close down Illy and then either press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible) or Move the folder with Illy closed (more tedious but also more thorough and reversible).
Both will reset the preferences; the latter way you may move the folder back if it brings no cure to recover customized preference settings.