[DMDX] Display errors and delay parameter Hi all, I am testing the following DMDX code using DMDX 3.1.4.4.               +001    /  "#######" /   "prime1" / *   "TARGET1"; +002    /  "#######" /   "prime2" /  *   "TARGET2"; +003    /  "#######" /   "prime3" / *   "TARGET3"; +004    /  "#######" /   "prime4" /  *   "TARGET4"; $ 0 "THE END"; $ When I run this code I get display errors for each item:    Item       RT       COT       3  -2000.00      0.00 !  Display error at msec 4105.97, tick 345 in item 2, frame "" !    moved into video memory 132 ticks late !     (previous frame's duration will have been longer)       2  -2000.00   3588.56 !  Display error at msec 7694.17, tick 650 in item 1, frame "" !    moved into video memory 132 ticks late !     (previous frame's duration will have been longer) However, when I remove  from the parameter line the display   errors disappear! refresh 11.77ms    Item       RT       COT       1  -2000.00      0.00       3  -2000.00   4047.43       4  -2000.00   8094.86       2  -2000.00  12142.29 The display errors reappear however when I remove  from   each item and put  on the parameter line. I don't understand   this. The display errors also disappear when I remove  from   each item and change the  on parameter line to ! Can   somebody explain this behavior? Thanks, Walter