Thanks for your suggestions. I think the problem was due to an injured player, but I thought I had substituted him properly. What I ended up doing was using the "autofill" function to dump the problem and then went through the chart making adjustments, very slowly and carefully. That got rid of the program's objections to my depth chart and still allowed for my preferences.
Speaking of depth chart preferences - This has come up in another thread, but I am sometimes "mystified" by the autofill choices. Does the game make assignments on the basis of two ratings or does it use more? I know the profiles list two ratings per position, e.g., RB: speed, strength, etc. Are more than two ratings considered in the algorithms that determine play outcomes? I am wondering how obsessive to be when ordering my depth chart. For example, re LBs I can see block avoidance, strength, speed, agility, and intelligence all being important. I also assume (in my abject ignorance of such things) that the more parameters there are in the alogrithms the harder it is to write the program. Just wondering.
Also, and I think I asked this once before: when attempting to model an actual roster gleaned from a team website (e.g., Wisconsin-Whitewater) I usually find only physical characteristics, e.g., weight and height. Using "old coach's" chart I can translate weights into strength and maybe speed, but not much else. Does anyone have any thoughts about this. I am prepared to find that I am the only one who cares about this issue.