1.4.4.
One my rig always failed on devfee:

[2018-04-19 17:16:29] Connecting to xmr-eu1.nanopool.org:14444
[2018-04-19 17:16:30] Connected!
[2018-04-19 17:16:30] Pool difficulty: 120001
[2018-04-19 17:16:30] Pool sent a new job (ID: 17013)
[2018-04-19 17:16:34] Pool sent a new job (ID: 17014)
[2018-04-19 17:16:34] Pool accepted result 0x00005926
[2018-04-19 17:16:38] Pool accepted result 0x000037CC
[2018-04-19 17:16:42] Pool accepted result 0x0000849B
[2018-04-19 17:17:05] Pool accepted result 0x00007510
[2018-04-19 17:17:17] Pool accepted result 0x000060FA
[2018-04-19 19:13:29] Connected to devfee pool
[2018-04-19 19:14:34] Disconnected from devfee pool
[2018-04-19 19:14:34] Now mining for user

Ahter last string nothing happens.