I have noticed now a few times that when ECO'ing a schematic from Logic through to Layout, some of the rules get "corrupted". For instance I would have a clearance rules of 65 (mil) but it sends through 37.5 etc. I double check the rule setup and the values are correct however when I look at the ECO file, the values seem somewhat random or some kind of "average" between default and the rules I entered. I cannot really explain the values I see other than that they are completely wrong. The only way to "fix" the problem seems to be either deleting all the rules in Layout and Logic for that particular net, recreating them and ECO'ing through or deleting the relevant net, ECO'ing then recreating the net. This issue seems to have cropped up a number of times however I cannot establish any particular method to recreate it.
Any suggestions as to settings I should check?
I am using PADS vX.0