Printer not working after first print

[JasonByrne]

Hello everyone,

I am new here. We have a very old software written in LabView that has been recently recompiled from the old 2011 version to a newer LV version (2019 SP1). The software is extremely complicated and vast. I tried to locate the printer VI or at least where it is being triggered to print, but couldn't find it. But directly to the question I wanted to aks along with a brief description of the isses:

After the printer prints once after the software had generated a report, it does not print anymore. I have to restart the whole software to print once again. This repeats.

Had anyone had any such issues after recompilation? Could it be a driver?

I would gladly post the VI that controls the printing IF I can find it.

Thank you very much for any hints or tips!

[OliverShultz]

If there is no printing code anywhere, one possibility is that at last one of the VI is set to "automatically print panel every time the VI completes execution".

[DaneShayd]

I’d double-check if the print job reference is being closed too early or if the upgraded version left an old config path dangling. I once solved a similar freeze by forcing the printer driver to reinit on each call. While testing labels, I used bartender software, which made it easier to spot whether the issue came from the app or the printer driver itself.