It looks like the Python signer is failing to populate the pubkey list of the unsigned tx object when it comes to imports. I'll investigate. For now, set yourself in expert user mode and try to manually pick the C++ signer at spend time, see if that fixes your issue.
(ERROR) TxFrames.py:925 - Problem sending transaction!
Traceback (most recent call last):
File "/usr/lib/armory/ui/TxFrames.py", line 919, in createTxAndBroadcast
ustxSigned = self.wlt.signUnsignedTx(ustx, signer=self.signerType)
File "/usr/lib/armory/armoryengine/PyBtcWallet.py", line 2722, in signUnsignedTx
cppsigner.signTx()
File "/usr/lib/armory/CppBlockUtils.py", line 4165, in signTx
return _CppBlockUtils.PythonSigner_signTx(self)
RuntimeError: failed signature
(ERROR) Traceback (most recent call last):
File "/usr/lib/armory/ui/TxFrames.py", line 919, in createTxAndBroadcast
ustxSigned = self.wlt.signUnsignedTx(ustx, signer=self.signerType)
File "/usr/lib/armory/armoryengine/PyBtcWallet.py", line 2722, in signUnsignedTx
cppsigner.signTx()
File "/usr/lib/armory/CppBlockUtils.py", line 4165, in signTx
return _CppBlockUtils.PythonSigner_signTx(self)
RuntimeError: failed signature
Traceback (most recent call last):
File "/usr/lib/armory/ui/TxFrames.py", line 919, in createTxAndBroadcast
ustxSigned = self.wlt.signUnsignedTx(ustx, signer=self.signerType)
File "/usr/lib/armory/armoryengine/PyBtcWallet.py", line 2722, in signUnsignedTx
cppsigner.signTx()
File "/usr/lib/armory/CppBlockUtils.py", line 4165, in signTx
return _CppBlockUtils.PythonSigner_signTx(self)
RuntimeError: failed signature