When Microsoft came out with Windows Vista a strange bug sprang up in Vulcan. Any time the user clicked a point in Envisage, multiple white lines or an entire white box appeared between the selected point and the current mouse location. This situation would persist until another point was clicked and then started again with the selected point and the new pointer location. Because this screen issue affects where the mouse pointer is located, it is almost impossible to click on the desired objects. This bug also affects Windows 7.
The problem is in the way Vulcan handles the buffer and screen refreshing. I thought that this issue had been corrected with version 8.0 but I recently helped a co-worker who was still having this problem in version 8.0.3. If you are having trouble with Vulcan and the OpenGL graphics, here is a work around.
- Go to the Windows start button and right click on 'Computer'
- Select 'Properties'
- In the 'System' panel select 'Advanced system settings'
- In the 'System Properties' panel select the 'Settings' button under the 'Performance' section
- In the 'Performance Options' panel de-select the 'Enable desktop composition' checkbox
These steps will fix the rubber band problem with selecting points in Vulcan but it will also limit the performance of Windows. The dynamic backgrounds and the glass effect on windows will not be functional with desktop composition disabled. If you still want to have these effects available, you can chose to disable desktop composition only while Vulcan is active. To do this follow these steps.
- Go to the Windows start button and right click on the Vulcan icon
- Select 'Properties'
- In the 'Compatibility' tab, check the box: 'Disable desktop composition'
- Click 'OK'
With these settings, Windows will turn off desktop composition every time you start Vulcan and turn it back on when Vulcan is closed. A pop up message will remind you of this fact every time this happens. Most people I know who use Vulcan, have a tendency to open the program and leave it on all day because they come back to it so often. If Vulcan is always on, then desktop composition is always off and there is no reason to have it dynamically turning on and off inversely with Vulcan.