Further, I also found most Javascript stuff broken until I cleared the cache - going through host details (ie Snapins, Hardware) didn’t work amongst other things.

From what I experienced it’s not to do with hostImage. It appears to purely be a browser caching issue. I only had it from PCs that had recently accessed FOG 0.32 when accessing FOG 1.0.1. PCs that had not accessed the old-version FOG server didn’t have the issue, and once clearing the cache in Firefox in my laptop, the problem went away.