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Reading the code despite of its irritating formatting reveals the problem: WorkOrdersSelectedRow := WorkOrdersGrid.Selection.Top; if FWorkOrderManager.GetWorkOrderDataByIndex(WorkOrdersSelectedRow - 1, Data) then // evaluates file index FileIndex := ARow - 1; if (FileIndex < 0) or (FileIndex >= TWorkOrderData.FILE_DATA_SIZE) then Exit; FileIndex will not be initialized when the if clause fails. BTW, it also irritates that the compiler is charged guilty first.

TMS Cloud Pack is the best I know of. (There are a few varieties of it.) There's a free trial that works when running inside of the IDE if it's just for your own use. Only you can place a value on your own time. Far too many programmers undervalue their time and refuse to pay for stuff that costs less than a day's earnings, some less than one hour's earnings. Also, if you're building a solution that's going to put money into your pocket (by selling to clients), then why should someone pay you for something of value if you don't see the value in the work others do? You pay people to prepare food for you; you pay for electricity delivered to your house; you pay for water, sewer, and garbage collection; you pay for clothes that people make; you pay for food that people farm; you pay for music, for movies, for popcorn; you even pay $1 or more for a bottle of water where the bottle costs more than the water inside of it; but you won't pay for software that people write? Let's say it took someone a week to build each of the interfaces in TMS VCL Cloud Pack -- it's probably more than a month, with all of the testing, support, and other stuff they've got invested, none of which you're going to provide by rolling your own -- and you don't think it's worth it to save yourself a month or more of your time by paying $200 USD or so to have a solution ready-to-go in 5 minutes? Do you only earn $200 per month? Is that how LITTLE you value your time -- that you'd "spend" 200 hours of your time in order to "save" $200? That works out to a whopping $1 per hour that you value your programming skills at. This whole notion of "software should be free" baffles the hell out of me. It's like when the CEO of Spotify said recently, "Very little effort goes into making music." Then he raised his subscription rate. Yeah, like that took him a few thousand hours to do. It will actually put a few hundred million dollars into his pocket, while not adding a penny of income to the artists who he's hardly paying for the "very little effort" they put into their artistry. I paid for a college degree in Math and Computer Science. I've spent 40+ years honing my skills, and untold thousands of dollars on tools, hardware, and services. I charge a lot for my time as a software developer, because I believe I deserve it. If someone would rather hire someone from India at $2/hr that's fine by me. You get what you pay for. But I've ALWAYS found it FAR CHEAPER to pay for software that has hundreds if not thousands of hours of work behind it than trying to do it myself from scratch. People PAY ME TO BUILD STUFF FOR THEM! Why would I want to charge them for the time it takes me to re-invent something from scratch that I can buy that's already working, debugged, and production-ready? Spending $200 for a software library that probably has over 1000 hours of work put into it is a SCREAMING DEAL in my mind. (Would it surprise you to learn that I have a TMS ALL-ACCESS PASS license?) BTW, did you write your own Delphi compiler and IDE?