I have started using 2011 on a new project and I'm having trouble with the new line numbering feature.

First - getting the number to "stick" is inconsisent. I enter the number and advance to the next cell. Sometimes it will take, and sometimes it will revert to "unassigned". I haven't figured out what the pattern is (hit enter? hit tab?) to get the initial number assignment to stick.

Second - when I do get a number to stick and have it follow continuing nodes, when I use the break command to split a segment, the number assignment gets deleted from both segments. I use the break command a lot to build models and this is proving to be a considerable nuisance.

So, while I like the concept of being able to assign an identifier to a group of elements, the execution so far is proving to be a hassle.