This is usually because of the latest drivers in a rig with older cards...  What cards do you have and what SDK and Catalyst Drivers are you using?

A lot of cards have come out since the 5xxx series (6xxx, 7xxx, etc...).  Newer drivers are geared to make sure the latest cards that are out work correctly, sometimes at the expense of the older cards.  The best (mining) drivers for the 5xxx series is usually the catalyst 12.4 and SDK 2.5 versions.

I love guiminer and have been using it for a good while. I want to know though, is there any difference in hashrate or temps between guiminer and cgminer assuming the card settings are the same?

Just upgraded to Windows 8 on my mining rig.  I've now got a HD5870, a HD6970 and a HD7850 all mining happily together with minimal effort.  Windows 7 was a nightmare for me with this hotch-potch of hardware.

Also getting this error myself..

2013-06-02 16:31:02: Listener for "Default" started
2013-06-02 16:31:04: Listener for "Default": api2.bitcoin.cz:8332 02/06/2013 16:31:04, checking for stratum...
2013-06-02 16:31:04: Listener for "Default": api2.bitcoin.cz:8332 02/06/2013 16:31:04, started OpenCL miner on platform 0, device 0 (Juniper)
2013-06-02 16:31:04: Listener for "Default": api2.bitcoin.cz:8332 02/06/2013 16:31:04, no response to getwork, using as stratum
2013-06-02 16:31:04: Listener for "Default": api2.bitcoin.cz:8332 02/06/2013 16:31:04,  No JSON object could be decoded
2013-06-02 16:31:14: Listener for "Default": api2.bitcoin.cz:8332 02/06/2013 16:31:14, Failed to subscribe
2013-06-02 16:31:16: Listener for "Default": api2.bitcoin.cz:8332 02/06/2013 16:31:16, IO errors - 1, tolerance 2

I have question regarding Eligius pool via GUIMiner.

I get constantly  "Listener for "Eligius ATI": gbt.mining.eligius.st:9337 [or getwork.mining.eligius.st:8337 not to mention bugged stratum] 08/06/2013 22:52:55, warning: job finished, 1:0:Tahiti is idle"

Then "Listener for "Eligius ATI": gbt.mining.eligius.st:9337 [ + same as above] 08/06/2013 23:02:57, long poll IO error"

And finally card just stops working with something like:


Card just spins up and down, up and down. It is more annoying than constant whine of overworked fans. GUIMiner is only way for my 7950 to work on Eligius on my primary PC. Tried to setup Eligius via CGMiner but it detects only first VGA which is GTX580 (not used for mining) even when I explicitly select 7950. BTW: If I plug GTX580 via CUDA miner on Eligius it works like charm. And if I run CGminer from Command prompt it can also run only GTX580 (Tahiti is not on list of GPUs although it is detected when cgminer is started with -n parameter).

On different PCs where I have only 1 VGA (7950) CGMiner via GUIMiner works (although it always show "connection problems" but mining works OK and I didn't noticed Listener messages.

Any tips?

W7 64b/GTX580 MSI TF3 (primary)/7950 MSI TF3 (miner)

On Slush this setup works nice, but Eligius have certain appeal to me as whole, and (sadly) Slush is often target of DDoS.

http://eligius.st/~gateway/faq/im-getting-warning-job-finished-miner-idle-messages

I'm having the same issue.  I'm at work, connecting to my mining rig at home with a very dodgy LogMeIn connection, so haven't tried to update poclbm yet.

Running into the same problem here

I was getting the No JSON object could be decoded message

I went back to a previous version as was suggested here  guiminer (2-19-12)  

also went to stratum.bitcoin.cz:3333 also suggested here. Getting a different error message now

2013-06-21 10:58:41: Listener for "Default" started
2013-06-21 10:58:42: Listener for "Default": stratum.bitcoin.cz:3333 21/06/2013 10:58:42, Problems communicating with bitcoin RPC 0 2
2013-06-21 10:58:43: Listener for "Default": stratum.bitcoin.cz:3333 21/06/2013 10:58:43, Problems communicating with bitcoin RPC 1 2
2013-06-21 10:58:44: Listener for "Default": stratum.bitcoin.cz:3333 21/06/2013 10:58:44, Problems communicating with bitcoin RPC 2 2
2013-06-21 10:58:45: Listener for "Default": stratum.bitcoin.cz:3333 21/06/2013 10:58:45, Problems communicating with bitcoin RPC 3 2
2013-06-21 10:58:45: Listener for "Default": stratum.bitcoin.cz:3333 21/06/2013 10:58:45, No more backup pools left. Using primary and starting over.

any other suggestions?

Hello everyone!

any time i try to run the latest version i get this error
"guiminer.exe - Entry Point Not Found"

The procedure entry point wcscat_s could not be located in the dynamic link library ntdll.ll."

i've done some searching and haven't been able to find much.
i'm running Windows Vista Business 64-bit sp2
my pc specs:
AMD Phenom II X4 965
4.00 GB Dual-Channel DDR3 @ 666MHz (9-7-9-18)
MICRO-STAR INTERNATIONAL CO.,LTD 790FX-GD70(MS-7577)
ATI Radeon HD 4800 Series