Try upgrading to 0.95.1. IIRC this issue with "transaction does not exist in Armory's database" is one of the known bugs of 0.94.1.
Also, please post the Armory log files.
Which logs do you need?
Just go to File > Export Log Files and post the contents of the resulting file.
OK - will send via private msg right now.
BTW, 0.95.1 doesn't start on my OSX Sierra 10.12.2 - any fix?