I have an old 16-bit purpose-specific app with no internal way to select a printer. In the past, I have used the Lubuntu Printers dialog to select a target printer as default before starting the app, and the app prints to it fine.
Sometime in the last few weeks, this has stopped working. The app always prints to a single printer, whether or not it is set as the default.
Other Win apps running under Wine that have the ability to select a printer from within the app work OK. Linux printing works OK.
It's acting like some setting is "stuck" somewhere.