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Sounds like a library call problem. All later labview versions are extremely non-resilient to pointer failures. The fact that it works fine on x32 but not x64 kind of points to an invalid pointer being passed (usually passing a fixed size pointer rather than a pointer-sized). I don't know what the GDS is, but are there an CLNS in the code?

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Maybe use compare elements and then exclude the items you're not interested in; a variation of this: http://lavag.org/topic/7335-wildcards-with-search-1d-array-prim/page__p__42656#entry42656

Here you may find lvserial library for serial communication. I used it once in application with high performance requirements. Additional advantage is that you don't have to include NI-VISA installer...

JGCode: Have you tried this in LV 2012? Opening and running your example project, it is taking 24 seconds to launch the Preferences Dialog and between 5 and 10 seconds to switch pages within the dialog. No idea why. Just doing Tools>>Options within LV comes up within half a second (human counting, didn't bother actually benchmarking). (I would try installing into my LV 2011 to compare, but VI Package Manager won't talk to LV 2011 on my machine... keeps complaining about the VI Server security settings no matter how I set them... it's almost certainly my fault -- I've got my 2011 loaded with almost every module and who knows how many packages in an attempt to replicate a weird CAR report, but until I get that untangled, I don't have a 2011 to look at.)

Sometimes when I need to search through cluster arrays with some element values excluded, I do like this Download File:post-5958-1206627103.vi 1. Turn cluster array into a boolean cluster array by checking equality 2. Filter the active element by performing an AND operation 3. Search for the desired boolean cluster pattern In this case the resulting index is 4, since the first element wasn't activated. Hope this helps. /J