Why has the print "preview print" stopped working?
Windows 7 Thunderbird 68.6.0 (64-bit)
When I click on Print Preview under 'File' I get a glimpse of a popup window:
Print Preview Title: xxxxxxxxxxxxxxxxxxxxxx Preparing... Progress
I then get a larger window with the header
xxxxxxxxxxxxxxxxxxxxxx - Thunderbird
After a fraction of a second they both disappear.
This seems to be a long standing issue with Thunderbird.
There is absolutely no diagnostic information.
Wšykne wótegrona (1)
Right, it may be bad form to reply to your own problem but.....
I went to Tools -> Options -> Advanced -> Config Editor..
Accepted the risk of here be dragons and types print in the search bar.
In here were a number of old printers I haven't used for ages. So......
I deleted the unused printer driver and remnants as per:
https://knowledge.autodesk.com/search-result/caas/sfdcarticles/sfdcarticles/How-to-manually-uninstall-a-printer-driver-in-Windows.html
For some explained reason I can now use print preview.
There may have been a number of other actions I took so not uncertain if this was the 'whole' story.