Here is some logging I see out of the CLI miner, which I believe I've setup to match 6 cores and GPU intensity 2... I'm guessing the GUI miner is having the same issue, which is why I can't get anything out of it.

D:\Temporary\MinerGate-cli-4.04-win64>minergate-cli.exe -user -bcn 6 2 -fcn+xmr 6 2
[2015-07-29 20:21:55.133] [ info]  Pool parameters query...
[2015-07-29 20:21:56.208] [ info]  Loading miners...
[2015-07-29 20:21:56.209] [ info]  Miners loaded successfully
[2015-07-29 20:21:56.209] [ info]  CUDA: Initializing CUDA miner...
[2015-07-29 20:21:56.284] [ info]  CUDA: Device name: GeForce GTX 970
[2015-07-29 20:21:56.284] [ info]  CUDA: Total memory: 4294967296
[2015-07-29 20:21:56.284] [ info]  CUDA: Free memory: 3900645376
[2015-07-29 20:21:56.284] [ info]  CUDA: MP count: 13
[2015-07-29 20:21:56.284] [ info]  CUDA: MP threads count: 2048
[2015-07-29 20:21:56.284] [ info]  CUDA: CUDA version: 5.2
[2015-07-29 20:21:56.284] [ info]  CUDA: CUDA cores: 1664
[2015-07-29 20:21:56.284] [ info]  CUDA: Threads per block: 1024
[2015-07-29 20:21:56.284] [ info]  CUDA: Dim size: 1024 | 1024 | 64
[2015-07-29 20:21:56.284] [ info]  CUDA: Grid size: 2147483647 | 65535 | 65535
[2015-07-29 20:21:56.538] [ info]  CUDA: Calculated threads per block: 8
[2015-07-29 20:21:56.538] [ info]  CUDA: Calculated blocks: 208
[2015-07-29 20:21:56.538] [ info]  CUDA: Total threads: 1664
[2015-07-29 20:21:56.539] [ info]  CUDA: CUDA miner successfully initialized
[2015-07-29 20:21:56.885] [ info]  Successfully connected to pool: stratum+tcp:/
/195.154.181.121:4559. session_id="13ae5a1b-11e5-4f89-8681-e7375ae25422"
[2015-07-29 20:21:56.885] [ info]  New Job: job_id="da9c5d7f-59e6-42e3-a2d6-45de
cbcb8f11" blob="0101a6b1e6ad0561e7a205747606d3b4191c92f6c017b38c34559cbabc5fba81
f4522ee2e1382c000000001228fe5420b13ca358d401832a6b25410de79e692cf3381359da06861 2
af95a301" target="e4a63d00"
[2015-07-29 20:21:56.885] [ info]  New difficulty: 1063
[2015-07-29 20:21:56.943] [ info]  Successfully connected to pool: stratum+tcp:/
/176.9.147.178:4555. session_id="9858790f-b89d-4749-9d5c-445081295b6f"
[2015-07-29 20:21:56.943] [ info]  New Job: job_id="0e1518b7-47b7-4a19-bf40-3f85
f47a8daa" blob="0101a1b1e6ad0561e7a205747606d3b4191c92f6c017b38c34559cbabc5fba81
f4522ee2e1382c00000000e1dcf9429a4c27165955b0263a7a388912ab66c0ab676db6187a5c295 0
d26cc301" target="e4a63d00"
[2015-07-29 20:21:56.943] [ info]  New difficulty: 1063
[2015-07-29 20:22:00.143] [ info]  New Job: job_id="c6cc30c5-4b8d-4294-90fd-3791
05f2d34c" blob="0101a6b1e6ad0561e7a205747606d3b4191c92f6c017b38c34559cbabc5fba81
f4522ee2e1382c00000000d6cc678f63980a457ace4e500453974278a62e2854760c0d580a9e242 2
ba102801" target="e4a63d00"
[2015-07-29 20:22:00.143] [ info]  New difficulty: 1063
[2015-07-29 20:22:01.760] [ info]  New Job: job_id="7728f65e-3313-489f-835a-2265
4ebb14b7" blob="0101a1b1e6ad0561e7a205747606d3b4191c92f6c017b38c34559cbabc5fba81
f4522ee2e1382c00000000a54b17f0aee7c6bb57166758536eb58631186cb3b7e9a9466c5027516 3
e0f15f01" target="e4a63d00"
[2015-07-29 20:22:01.760] [ info]  New difficulty: 1063
[2015-07-29 20:22:01.767] [error]  CUDA: unspecified launch failure
[2015-07-29 20:22:01.817] [ info]  CUDA: Initializing CUDA miner...
[2015-07-29 20:22:03.017] [ info]  CUDA: Device name: GeForce GTX 970
[2015-07-29 20:22:03.017] [ info]  CUDA: Total memory: 4294967296
[2015-07-29 20:22:03.017] [ info]  CUDA: Free memory: 3900645376
[2015-07-29 20:22:03.017] [ info]  CUDA: MP count: 13
[2015-07-29 20:22:03.017] [ info]  CUDA: MP threads count: 2048
[2015-07-29 20:22:03.017] [ info]  CUDA: CUDA version: 5.2
[2015-07-29 20:22:03.017] [ info]  CUDA: CUDA cores: 1664
[2015-07-29 20:22:03.017] [ info]  CUDA: Threads per block: 1024
[2015-07-29 20:22:03.017] [ info]  CUDA: Dim size: 1024 | 1024 | 64
[2015-07-29 20:22:03.018] [ info]  CUDA: Grid size: 2147483647 | 65535 | 65535
[2015-07-29 20:22:03.289] [ info]  CUDA: Calculated threads per block: 8
[2015-07-29 20:22:03.289] [ info]  CUDA: Calculated blocks: 208
[2015-07-29 20:22:03.289] [ info]  CUDA: Total threads: 1664
[2015-07-29 20:22:03.290] [ info]  CUDA: CUDA miner successfully initialized
[2015-07-29 20:22:06.199] [ info]  BCN hashrate: 104989 H/s
[2015-07-29 20:22:06.199] [ info]  FCN+XMR hashrate: 45.5851 H/s
[2015-07-29 20:22:16.209] [ info]  BCN hashrate: 117576 H/s
[2015-07-29 20:22:19.203] [ info]  FCN+XMR hashrate: 46.939 H/s
[2015-07-29 20:22:19.420] [ info]  Share submitted successfully!!!
[2015-07-29 20:22:20.182] [ info]  Share submitted successfully!!!
[2015-07-29 20:22:22.026] [ info]  Share submitted successfully!!!

By comparison, here is without GPU:

D:\Temporary\MinerGate-cli-4.04-win64>minergate-cli.exe -user -bcn 6 -fcn+xmr 6
[2015-07-29 20:34:36.055] [ info]  Pool parameters query...
[2015-07-29 20:34:37.092] [ info]  Loading miners...
[2015-07-29 20:34:37.092] [ info]  Miners loaded successfully
[2015-07-29 20:34:37.470] [ info]  Successfully connected to pool: stratum+tcp:/
/176.9.147.178:4555. session_id="e36942b1-e656-43ac-9968-43f3c3a71e1a"
[2015-07-29 20:34:37.470] [ info]  New Job: job_id="34116004-4a64-470a-9778-a71e
da8fbcc6" blob="010196b7e6ad056da936cde9dc183b662fc77daae0e2875e0764636cc3abebf4
f417bb1bba83c0000000007a2588d01140fe661af355103bca351d0f3779690f2e9e5c742bab270 a
dee5d502" target="e4a63d00"
[2015-07-29 20:34:37.470] [ info]  New difficulty: 1063
[2015-07-29 20:34:37.495] [ info]  Successfully connected to pool: stratum+tcp:/
/176.9.47.243:4559. session_id="8b1a0ba0-b3ec-4791-9f02-16d4b531bb96"
[2015-07-29 20:34:37.495] [ info]  New Job: job_id="cee330a0-8db3-4488-892d-fb60
3be2ed8b" blob="01019fb7e6ad056da936cde9dc183b662fc77daae0e2875e0764636cc3abebf4
f417bb1bba83c000000000b122f55c29f13188333d19747eefb4f1f4328b257980fdfc24ce05cc0 7
2a9a2e02" target="e4a63d00"
[2015-07-29 20:34:37.496] [ info]  New difficulty: 1063
[2015-07-29 20:34:41.135] [ info]  Share submitted successfully!!!
[2015-07-29 20:34:41.255] [ info]  New Job: job_id="40a5d2b0-14a0-44d7-a145-6084
c75309ec" blob="01019fb7e6ad056da936cde9dc183b662fc77daae0e2875e0764636cc3abebf4
f417bb1bba83c000000000a783c0123d75f898b44fd720e5c67a3ce2b34ab32dc404aa843f7cbbf f
3c716002" target="e4a63d00"
[2015-07-29 20:34:41.255] [ info]  New difficulty: 1063
[2015-07-29 20:34:41.591] [ info]  New Job: job_id="621b1d07-0cc7-495d-8576-3ff1
5f3e891f" blob="010196b7e6ad056da936cde9dc183b662fc77daae0e2875e0764636cc3abebf4
f417bb1bba83c00000000073e043cedd42f0dda5a5545cde9d66e8d29d9571c1cdef44e3293d336 8
8abf8102" target="3e5f1900"
[2015-07-29 20:34:41.591] [ info]  New difficulty: 2583
[2015-07-29 20:34:47.089] [ info]  BCN hashrate: 110.68 H/s
[2015-07-29 20:34:47.089] [ info]  FCN+XMR hashrate: 109.68 H/s
[2015-07-29 20:34:57.095] [ info]  BCN hashrate: 109.334 H/s
[2015-07-29 20:34:59.382] [ info]  FCN+XMR hashrate: 109.434 H/s
[2015-07-29 20:34:59.614] [ info]  Share submitted successfully!!!

Something seems wrong to me when I enable GPU mining.