Dear Roland, thanks, this was a very helpful hint. In Tools/Customize-> Keyboard cmd-x was associated with TexMaths, although in TexMaths prefs cmd-t was selected, see screen shots. I deleted that entry, now I'm back to normal operation. thanks again, Wolfgang
Incorrect Shortcuts
TexMath 0.43, 0.44 fails with LibreOffice 5.3.7
PDF as output format
location of MacTex executables
Presentation on 2nd screen