TRy this:

Tools > Options > Advanced > General tab click on 'Config Editor' button it will tell you to be careful :)

Inb top search type: font look for: font.XXX.XXX" that is in bold

right click on line and choose 'reset'

Close config Editor = top right X click on OK to save changes to options.

then try to print.

You may need to reset your selections in: tools > options > display and the composition tabs.

Did not fix problem, Where can one turn to for support/help?

Check your margin settings in page setup. If they are too large, apparently it prints blank pages.

File > Page Setup > Margins & Header/Footer tab

I use top. left and right on 12.7 and bottom on 20.0 and this prints ok for me.

What do you have? Usually, if the margins are wrong in the Print Preview then you will not see a Print Preview either, but you say: The print preview option works fine too. So I would not have expected this to be the issue.

Check the actual Printer settings: when you click on 'Print', the Print window should open. check: you have selected the correct printer, printer range and number of copies. click on 'Properties' and then use the various tabs to check settings: check you have selected the correct paper size.

If using 2 sided printing. check the margins selected. If there is also an option to reduce the size of the document, check that it has not reduced so far that it cannot print anything.

Check to see if it works ok in Thunderbird safe mode. In thunderbird Help > Restart with Addons disabled

If it works ok, then an addon is causing a conflict.