This seems to be related to multi-monitor setups and in some cases, remote access.
The symptoms are when a section of IQMS is clicked that would create a new, separate window, nothing appears and the IQMS main toolbar can't be accessed, and must be force closed to use IQMS again.
The solution is to force the newly created IQMS window to appear on the current desktop by pressing (simultaneously) ALT-SPACEBAR-X immediately after clicking the item that should have created a new window. If you have clicked elsewhere after that step, close IQMS via the Task Manager, re-open it, and replicate the issue by clicking the section that creates the window, and then press ALT-SPACEBAR-X right away. The missing window will appear in the center of your current desktop, and won't be missing next time.