Being a discessionary trader I put various lines on the chart both through EL program control and manually for more random purposes such as marking my trade calls. Every so often when I clone an existing line which I had placed manually, the clone of that line vanishes. I suspect it is at a time when the other lines I have on the chart which are created by EL program control are being moved to a new location . It is pretty obvious that it is a bug of some sort. I haven't tried to figure out where this clone line goes (maybe just vanishes, maybe moved to the very first bar of the chart).
Its not real a big deal (it has been happening for months). I just try again and normally on the 2nd or 3rd try my copy is where it should be and I move it to where I want it.
This problem happens maybe 1 out of every 20 times I clone a line I have placed manually.
It is on MC2.1.999.999. I wasn't on MC3.0 for long and decided to go back so I don't remember if it happens there. Probably.