Well, the machine was upgraded to the newest version of Java. Now the plugin loads. However, an even worse problem now occurs:
We use the Read File Contents function that came with ScriptMaster.fp7. I've noticed that on Windows XP SP3 (on two different machines), the function causes FileMaker Pro 10.0v3 to crash if we attempt to read in anything other than very small files. For example, a 433 kilobyte file is read without a problem, and the results shown in the ScriptMaster.fp7 file. However, a 525 kilobyte file crashes every time on two different machines.
Also, I can no longer downgrade to ScriptMaster 3.1 on the machine with the upgraded Java, because when I tried, FileMaker crashes at the splash screen while loading the 3.1 plugin. I made sure only one plugin was in the various possible plugin folders.
So, now that I've upgraded the Java on that machine, it appears that I MUST use the ScriptMaster 3.33 plugin, which appears unable to read a file of more than about 500 kilobytes. I even tried re-writing the Read File Contents function to use a BufferedReader rather than the very simple getText() function, but that also crashed under the same conditions.
Any ideas? This is really interrupting my client's work. All for the sake of trying to be up-to-date using the auto-update feature.