First off, thank you to everyone who attended yesterday's webcast on Block Attributes. We had well over 200 attendees -- an excellent turnout! If you missed it, we'll be posting it to the AutoCAD LT Training page soon.
One of the things I talked about yesterday is what it means to lock an attribute's position in a block. The image below shows a block with 3 attributes. Two are locked, one is unlocked. Can you tell which is which?
The "View Title" and "Sheet Number" (a.k.a. 1) are locked, but the "Scale" is not.
When and attribute's position is locked, the only way to relocate the attribute is to use a dynamic parameter/action combo.
When it's unlocked, the attribute's grips are displayed when you select the block, and you can use them to reposition the attribute. You can't include unlocked attribute in a dynamic action's selection set.
Personally, I prefer to lock my attributes. It's cleaner, visually, and enables me to really control the behavior and location of the attribute.
You can set an attribute to be locked or unlocked when you create it, or you can change it later from the Properties Palette.