David,

>
> Is that possibly related to Network Drives and display of CHMs?
>

The strange thing is that the .chm is displayed without any problem if the
..exe (that launches the .chm) is started normally. But if the .exe is
executed from the .msi, then the .chm does not come up at all. The .msi
completely blocks it.

Let us assume, you create a start.exe (with Visual Studio, Clarion, etc.)
that launches a start.chm. This works fine until you execute start.exe from
an .msi. Starting the .exe from the .msi will "block" the .chm execution
process at all. You'll not even get the typical "Action canceled" error
page.

Friedrich