Troubles with eth solo in 5.1 (it's Shift, but I hope they are similar)
Piece of miner log with -dbg 1 switch
09:35:22:444 15a4 eth: job is the same
09:35:22:445 15a4 new buf size: 0
09:35:22:597 15a4 parse packet: 242
09:35:22:597 15a4 eth: job is the same
09:35:22:598 15a4 new buf size: 0
09:35:22:644 1724 http send request:
09:35:22:751 15a4 parse packet: 242
09:35:22:752 15a4 eth: job is the same
09:35:22:753 15a4 new buf size: 0
09:35:22:885 1724 http got answer: 00000000ffffffffffffffffffffffffffffffffffffffffffffffffffffffff00000000000000663d0215d1d2656acd622a39be66a99e452e8158d66413b9c400000000000000008e32875700000000f64626727af62c18c6f58c2ce7f14069b3eb313efcbe5dd304b349759f4c04cd
09:35:22:886 1724 SIA job updated
09:35:22:907 15a4 parse packet: 242
09:35:22:908 15a4 eth: job is the same
09:35:22:908 15a4 new buf size: 0
09:35:23:014 12c0 ETH: put share nonce 624243c05ada672
09:35:23:015 12c0 ETH round found 1 shares
09:35:23:019 15a4 ETH: 07/14/16-09:35:23 - SHARE FOUND - (GPU 0)
09:35:23:019 15a4 http send request: {"id":4,"method":"eth_submitWork","params":["0x0624243c05ada672","0x35b5d75ff1f31f33303e1b2068a211a6de7d42d5a602f1f5eb92d878d108ef8d","0xc5aa5c8eb0a2374bfaa36621962f0f343070b5534eb1b241154c50db98ae8d77"]}
09:35:23:022 15a4 SIAD http response: {"jsonrpc":"2.0","error":{"code":-32600,"message":"invalid character '\\x00' looking for beginning of value"}}
09:35:23:022 15a4 ETH: Submitted share rejected!
09:35:23:065 15a4 parse packet: 242
09:35:23:066 15a4 eth: job is the same
09:35:23:066 15a4 new buf size: 0
09:35:23:220 15a4 parse packet: 242
09:35:23:221 15a4 eth: job is the same
09:35:23:221 15a4 new buf size: 0
09:35:23:352 17e0 SC: put share nonce 12dbd09 enonce 67a30005
09:35:23:353 17e0 SC round found 1 shares
09:35:23:357 1724 SC: 07/14/16-09:35:23 - SHARE FOUND - (GPU 0)
09:35:23:357 1724 http send request: 00000000000000663d0215d1d2656acd622a39be66a99e452e8158d66413b9c409bd2d010500a3678e32875700000000f64626727af62c18c6f58c2ce7f14069b3eb313efcbe5dd304b349759f4c04cd
09:35:23:376 15a4 parse packet: 242
09:35:23:377 15a4 eth: job is the same
09:35:23:378 15a4 new buf size: 0
09:35:23:532 15a4 parse packet: 242
09:35:23:533 15a4 eth: job is the same
09:35:23:533 15a4 new buf size: 0
Node log isn't availiable for now, but it seems it simply works in mining mode (submits works on blocks and imports them). No messages about mining block((((