I have been using Datacad with the Layer Manager permanently open for ages. And have had no problems. Now: if the Layer Manager is open, there is a cursor arrow in the drawing area and not cross hairs. If I close the Layer Manager, the cross hairs return and I can draw as normal. Quite frustrating really.
Thanks Mark, but I could not see anything odd about mouse settings or the .ini file. However, one thing that I did not notice before, when the Layer Manager is open, nothing on the primary monitor works. But; close the Layer Manager and all is back to normal. Straaaange?