#12899 is currently causing the Windows builds to fail in a fairly reproducible way, including after nuking the travis cache.
Running tests: coinselector_tests from wallet/test/coinselector_tests.cpp
Running test/util/bitcoin-util-test.py...
/usr/bin/python3.4 ../test/util/bitcoin-util-test.py
2018-04-11 14:09:16,215 - ERROR - Output data mismatch for blanktxv1.hex (format hex)
2018-04-11 14:09:16,216 - ERROR - Output formatting mismatch for blanktxv1.hex:
*** blanktxv1.hex
--- returned
***************
*** 1 ****
- 01000000000000000000
--- 0 ----
2018-04-11 14:09:16,256 - ERROR - Error parsing command output as json: Expecting value: line 1 column 1 (char 0)
2018-04-11 14:09:16,295 - ERROR - Output data mismatch for blanktxv2.hex (format hex)
2018-04-11 14:09:16,295 - ERROR - Output formatting mismatch for blanktxv2.hex:
*** blanktxv2.hex
--- returned
***************
*** 1 ****
- 02000000000000000000
--- 0 ----