Softgrid/App-V Windows Installer Pop Up
Recently encountered an interesting Softgrid issue whereby the Windows Installer (Preparing to install) would pop up during the Application Launch phase (to pre-populate feature block 1). This became problematic as it would not go away, as this process was convinced some files were missing (ISKernel).
The following blog post from the Softgrid/App-V team was very useful. Use of the MSI Cleanup utility during the application installation phase worked a charm.