When I copy and paste a structure or when I drag and drop a structure within ChemDraw, I notice a significant delay or ChemDraw crashes. In other words, copying and pasting or dragging and dropping is slow or crashes ChemDraw.

When I copy and paste a structure or when I drag and drop a structure within ChemDraw, I notice a significant delay or ChemDraw crashes. In other words, copying and pasting or dragging and dropping is slow or crashes ChemDraw.

We are aware of three potential reasons why this problem might occur.

1. Virus protection software is one possible cause of the problem. The solution is to set the virus software to check only program files and not ALL Files.

2. Another possibility is that the printer driver is causing the problem, in particular the HP PCL 6 driver. ChemDraw must poll the printer driver to obtain certain information about the page settings. It does this polling after certain functions. This printer driver problem is not ChemDraw specific, it may occur with other applications. Please see the following related Microsoft Knowledge Base article for further details: http://support.microsoft.com/support/kb/articles/Q183/5/22.ASP?LN=EN-US&SD=gn&FR=0
This driver conflict has been fixed in ChemDraw 6.0.2 and above. We recommend upgrading to the latest version.

ChemDraw 6.0 users should download the free 6.0.2 update from the Support Downloads page:

http://www.cambridgesoft.com/services/DesktopSupport/Downloads/

Non 6.0.2 users:

Try switching to a different printer driver, like the PostScript version of the driver or even a generic one that comes with Windows.

3. The third possibility is the video driver. Try switching the color palette to 16 bit in the Display control panel Settings.