via Brad Merritt, Lead Game Designer @ Cartoon Network:

I am using Illustrator CS3 to create level layouts for an ingenious tool my Flash programmer wrote to parse my Illustrator layouts into proper level data for our game. This has made the workflow of game design to game programming smoother than ever. I simply place symbols from the library that are named in concert with our Flash elements.

However, an Illustrator problem is causing me unending headaches and lost work.

First, I struggled to find an easy way to make sure all objects snapped to whole pixel values (no decimals) and I could move objects by a single pixel. I finally settled in making 1px grid and turning on SNAP TO GRID.

Small Issue: Setting a grid size of 10px subdivided by 1px made my keyboard increments move 8px though my Keyboard Increments preferences is set to 1px. Setting grid to 1px fixed this.

Small Issue: Snap to grid works except when you drag a symbol from the library to the stage it does not snap to the grid. You have to move it again after you place it to make it snap to the grid.

Big Issue: Illustrator randomly moves and scales my objects on document close/open.

Step 1: This is my placed symbol with snap to grid.
Step 2: Save and close the file
Step 3: Open the same file and you get this:

This is happening to myself and my colleague working on a different machine on different documents on Illustrator 13.0 and 13.01 Windows XP SP2.