http://bugs.winehq.org/show_bug.cgi?id=3023
I have been fiddling with Orcad 9.2 Capture and have found the cause of the problem behind its inability to place parts, text etc. It is caused by the window that the object is to be placed in temporarily losing focus (or maybe activation) after the dialog box for entering the object's properties is closed. This temporary loss of focus causes the window to "lose its grip" on the object being placed.
Removing the line that calls WINPOS_ActivateOtherWindow in dlls/user32/dialog.c in the EndDialog function fixes this problem - the focus seems to immediately return to the correct window and the object can be placed.
The removal of this WINPOS_ActivateOtherWindow call does not seem to have any visible side-effects in this particular instance - does it have a purpose? (In this instance I traced its call to see what it activated - it does not find a valid window to activate, so reaches the end and calls SetActiveWindow(0)).