In the last few upgrades of Indesign something has stumped me. When I move or scale objects there is snapping to some sort of invisible grid. This happens when I move or scale something with my mouse but not when I move something with the the up and down arrow keys (I set the keyboard increments to a very small setting and that works). I've tried troubleshooting this problem by playing with the settings for guides and grids under the "view" menu, changing preferences for units and increments and guides and pasteboards, anything I can think of. Nothing turns this snapping off and it is impossible to do percision alignment when scaling because I can't scale with the up and down arrow keys, only the mouse and other input devices. I have been using InDesign for a long while so I am a relatively advaced user but I haven't been able to figure this one out.
I'm at work and checking these suggestions as they come in on what I'm currently working on. I should say rechecking because I think I've tried everything but taking a second look makes me notice more specifics. Objects snap wherever they are on the document and at even increments. It doesn't depend on proximity to other objects or guides. It's like they're snapping to an invisible grid that's everywhere but, as I said previously, "snap to document grid" is definitely turned off.
Alex, as I mentioned earlier I did have pixels as the units of measurement in my old document. Does choosing pixels create an automatic "snap-to" situation in the document?
Peter, snap to the grid was still turned off. In past situation for previous version of InDesign when some things in a document got corrupt, I was able to resolve the problem by pasting the stuff into a new document. I forget what the particular problems were but creating a new document and pasting stuff in it from the old document fixed it. Don't know if this is the case here.
Sorry, I totally missed that part of your answer.
Yes, if you have selected pixel as your unit of measurement, objects will snap to the pixel grid. It is entirely possible to have objects be placed outside of this grid, but when moving them around they will snap to the grid.
How did you go about changing the units of measurement for the document? If you aren't you should try (with rulers on) right clicking on the box in the top left hand corner where the rulers meet and selecting a different unit of measurement. I usually work in picas.

Alec, sorry I don't think you missed anything, I was mistaken: I don't think I did mention pixels earlier. I know a few ways to change the units of measurement. I most often use the right click method. It's the fastest.
I did a test and it is indeed the pixel unit issue. As you describe, objects snaps to the invisible "pixel grid" when pixels are chosen. This begs the question: When one is using pixels, is there a way to turn that grid off? Seems to me, if the dimensions of objects can measure in fractions of a pixel, how can I align two objects edge-to-edge when I'm snapping to whole pixels? Do I have to keep switch back and forth between different units of measurement? This is the problem I'm running into. By the way, I'm not creating web graphics but generating a layout in JPG format for a weekly HTLM email blast. Thanks so much for your help. Paul
I agree. If working in pixels there is an implication that all objects should have whole-pixel dimensions only and should sanp to the pixel grid since you cannot dispaly half a pixel or two pieces of different pixels in the same location on a screen.
That said, switching to points will get you exactly the same size realtionships in ID without the snapping.
…Here I am, several months later experiencing the same problem. Based off this thread I can now change the unit of increment that an object snaps to. But I don't want my objects to snap to any increment. Is there any way to turn this feature off so my objects snap only to guides and/or the document grid?
See Remove minor corruption by exporting. Maybe that will help.
North America
Europe, Middle East and Africa
Asia Pacific