convert_coord problem

["Klaus Scipal" <kscipal(at)ipf.tuwien.ac.at>]

Hi

I have a widget with several graphic windows. On of it returns the
co-ordinates of the mouse button if pressed. These co-ordinates are then
converted from device to data (longitude, latitude) using the convert_coord
routine, and some data is plotted in the other windows. Now comes my
problem: the convert_coord routine gives the correct co-ordinates only in
its first call. when I try to convert another pair of co-ordinates the
result is flawed. What can be wrong???

Klaus

p.s.: I use IDL 5.2 under Windows NT