if I place two LJ flanges together with the same line number isometric will run fine. However if I change the line number of one to show a break in line number it only runs one isometric and says there is a disconnect so can't run continuation isometric. This only happens with LJ Flanges. Any idea why this is happening?

What version of Plant Pro are you running ?

got it sorted, turner the isometric continuation graphics to 0 and it works fine.