Hi,
I'm not sure which activity caused the problem I just experienced, and I think I've fixed it, but thought I'd mention it in case it's something you're not aware of.
I recently upgraded to version 6.1, and, at the same time, I moved my .aip file - effectively up one level in the folder structure. For example, from C:\Users\David Payne\Versions\Installer Project Files, to C:\Users\David Payne\Installer Project Files.
When I next tried to build the project, I encountered several errors with file paths. I went through every menu option, and changed everything I could find (all references to icons, and the (synchronised) application folder), but was still seeing error messages about file paths. Eventually, I had to open the .aip file in a text editor, and amend the XML. It worked fine, I've just completed the build, but might be something that is important.
I'm afraid that I didn't make note of the changes I made, but one of them was referring to the 'control panel icon' - I think it had made a second instance of it in the '<COMPONENT cid="caphyon.advinst.msicomp.MsiIconsComponent">' element. I found '<ROW Name="controlPanelIcon.exe"' and '<ROW Name="controlPanelIcon_1.exe"' in there, one with the older file path, and one with the new file path. I changed the file path of the broken one, but still got an error (I think because the 'Index' attributes were both '0'), so I deleted the second entry, which fixed the problem. This removed the icon in the 'Product Details' screen, but I was able to simply re-add it with no problem.
Secondly, my bundled JRE broke - it's location changed from 'C:\Program Files\Java\JREXYX' to 'C:\Users\David Payne\Program Files\Java\JREXYZ' (the second file path might not be quite right, but it was a sub-directory of my 'Users' folder combined with the Program Files directory structure).
Hope this might be of some help, and sorry that I don't have a huge amount of detail. Probably worth saying that I'm using the Java version of AI, on Vista.
David.