On Windows 7 with Bitcoin Core 14.2 already running before starting Armory.
Everything is synced and seemingly running normally.

I open up the send dialog and fill in all the information.
When I hit "Preview Transaction"... nothing
When I hit "Send!"... nothing

Everytime I try a send this section is added to 'armorylog.txt':

2017-08-26 16:55 (INFO) -- TxFrames.pyc:689 - Change address behavior: NewAddr
2017-08-26 16:55 (ERROR) -- Traceback (most recent call last):
  File "ui\TxFrames.pyc", line 805, in createTxAndBroadcast
  File "ui\TxFrames.pyc", line 764, in validateInputsGetUSTX
  File "armoryengine\Transaction.pyc", line 2284, in createFromTxOutSelection
  File "armoryengine\Transaction.pyc", line 2193, in createFromPyTx
  File "CppBlockUtils.pyc", line 2988, in getTxByHash
DbErrorMsg: >



I tried installing 0.96.1 but the same thing. I went back to 0.96 because with 0.96.1 I had to manually start ArmoryDB.exe before starting ArmoryQt.exe and that got really annoying... and after a few restarts and reboots ArmoryDB.exe started crashing everytime I tried running it.

bitcoin.conf contains these lines:
rpcuser=myusername
rpcpassword=mypassword
server=1