This topic is just out of interest, but something strange happened when I tried to pansharpen (resolution merge) with ERDAS IMAGINE.
The SPOT 5 panchromatic and multispectral bands seemed to be slightly out of alignment, and result was a blurry output! I suspect its a data supplier issue. It also happened to someone in our department working in a different area, same data supplier and same software. I havent experimented with any other software yet.
Thankfully, the pansharpened image isnt crucial for my workflow, but as its happened at least twice, I was wondering if anyone else encountered this?