[mandrachek]

Indeed, the problem was an incomplete upgrade. Nothing to see here...

I think I might be hitting some kind of caching issue.

If I view the source of one my assembled pages, I get:
generatedBy:"v9.1p_2015-03-28/PowerEdition Deployment 2015-03-28",

If I do an isc.showConsole(), the version displayed is v9.1p_2015-05-27/PowerEdition Deployment (built 2015-05-27)

Seems like I have a mismatch between assembled files, and the version of SmartClient.