Errors communicating with my GPIB device in C++

I am trying to communicate with a GPIB device via a custom C++ program. I am using ni488-2.h and the associated obj file.
When I send the commands to the device "manually" through the Measurement & Automation Explorer, everything seems to work fine, consistantly.
However, when I try sending commands via code, per the example provided ("Show Sample") button. Some commands return an error, but not all of them, and not always the same ones.
The Measurement & Automation Explorer seems to wait after I send a command, and displays "Reading..." indicating that it is doing some sort of check to ensure there is data to be read...or something. However the sample code doesn't do this. It's the only difference I can find, without actually being able to see the code M&A Explorer uses.
Any help would be appreciated.
Thanks
EDIT: The device I am communicating with: S380 Dual Channel Optometer (UDT Instruments)
via: GPIB-USB-HS
using drivers (header file etc.) from May/Jun 2014

If you installed NI-488.2, it will install sample programs. In Windows 8.1 C:\Users\Public\Documents\National Instruments\NI-488.2\Examples

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Message was edited by: mangamak1

Hi
Testing Camera and Cable is important - very common origin to problems.
Especially the Cable (fortunately)
I had a serious accident some Years ago. FW-connector on the back of that Mac
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Tricky:
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That's why it is essential to know that it works OK on another Mac.
Here comes my list: Use it with care. No guarantie from my part - just sharing
my thoughts.
Capture/Import problems:
a) File-Vault is on - turn it off
b) don’t Daisy chain camcorder - external hard disk - Mac
(except for some Canon-Cameras)
c) Slow hard disk (fragmented: repair permissions, repair hard disk, use a faster hard disk)
d) Something is occupying the CPU/System, like other programs, Internet etc.
e) Bad RAM-chips
f) drop outs on the miniDV-tape - make a camera to camera copy on a tape which You have previous recorded with a time code (dummy recording).
g) FW-wire cable OK?
h) Break in the time-code on the miniDV tape (make a camera to camera copy on a tape which is prerecorded with nothing/anything so that the tape has a time-code from beginning to the end)
i) defective camera TRY IT ON ANOTHER MAC !
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l) Updating - OS has to be a clean install - not an update eg from X.3.x to X.4.x (no good)
OS X.4.0-2 needs a clean install to work (I use X.3.9)
m) Updating QT and/or other updates (to 7 needs v6 to be cleaned out first)
QT v.7 needs a clean install to work (I use 6.5.2)
n) Have you tried the crazy fix:
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Trash the Font Collections Folder.
These files are found:
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Mac:
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◊ Reset SMU
SMU: http://docs.info.apple.com/article.html?artnum=300341
◊ Bad RAM-chips
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◊ Something is occupying the CPU/System, like other programs, Internet etc.
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◊ Updating - OS has to be a clean install - not an update eg from X.3.x to X.4.x (no good) OS X.4.0-5 needs a clean install to work (I use X.3.9)
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Yours Bengt W

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