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I have an idea of what the problem may be. The DTR line on the serial port is used to reset the PBASIC processor. Presumably the processor needs to be reset before programming, etc. I'll bet that these laptops that are causing this are holding the DTR line in the wrong state when the Stamp software isn't programming them. If any of you have the capability, try making a serial cable that does not connect pin 4 across. (or you could just cut the pin 4 out of the end of an existing cable's connectors if you have a cable to sacrifice). This (hopefully) should allow you to debug (but it won't allow you to program). If you can debug with a cable like this then the next step would be to make a cable that has a switch in the line for pin 4 that you'd just have to toggle to get in and out of programming mode.
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