BasicService.getCodeBase returns wrong answer

I've been working on an applet that I'm just now sending out to "pre-alpha" testing. Of the 6 people who tried it, it works for four of them, but not for 2. (One of the failures is my boss!) All six are using the one website to test.
The problem is that I'm getting the wrong answer from BasicService.getCodeBase() on those two machines.
What I should be getting, and I am getting on the machines that work is: https://172.26.16.139/Heatmaps/app/ On the machines that fail, I get https://172.26.16.139/ Which is the document base.
I'm using the deployJava javascript and JNLP to launch the applet. The Control Panel -> View -> Show JNLP File shows the right code base on both failing machines.
I know two of the machines that work are running 1.6.0_22 and that one of the machines that fails is running _17.
I have two (make that three) questions:
1. Has anybody seen this bug? I don't see anything like it in the bug parade (now called "sun defects," I think).
2. Would Applet.getCodeBase() be more reliable? (I'll be trying that next. On one of the machines that work, I get the same, correct, answer.)
3. (For this you get extra points) How do I pick which plugin version to use in a browser? The "use next generation plugin" check box in the Java control panel has nothing to do with it. The IE(8) Advanced options just has a check box for using the plugin, not which plugin version. And this has nothing to do with the jre version. If I disable _22 and enable _17, I still get the _22 plugin. (Check the first two lines of the Java console.)
Edited by: Doctor Dad on Nov 13, 2010 2:22 PM

It's presumptuous to answer one's own questions, but the truth is this: BasicService.getCodeBase() gets it wrong until relatively recently, but Applet.getCodeBase() gets it right, at least in everybody who's tried it. (Not a lot of people.)

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10000     10000               0          1
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10002     10021               1          2
10003     10022               2          1
10020     10023               3          5
10060     10060                3          4
10080     10140               3          2
10040     10040               3          3
10100     10160               4          3
10160     10220               4          2
11640     11640               3          1
11660     11660               0          6
11661     11661               0          7
11600     11600               0          4
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38440     21680                         10000
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