Option menu strangeness

[Graham Samuel]

I'm developing an app under the RR IDE and one of the stacks shows a  
card with a lot of option buttons (menus) on it, allowing the user to  
pick stuff from a set of little lists and to see what has been picked.  
This has been working for ages: I read it by looking at the menuHistory  
of the buttons, and I can set them by setting the menuHistory also.

Suddenly today for about half an hour the thing stopped working. When I  
clicked on (any) of the buttons, I saw the list of options, but they  
wouldn't "stick", I mean if the options were

  A
  B
  C

and B was showing, then picking A or C did nothing: the button reverted  
to B as soon as I let go of the mouse. After a bit the problem went  
away, leaving me totally mystified. I realise it must be something I've  
done, but I can't guess what it could be. Has anyone got any  
suggestions? BTW the IDE seemed to remain stable while all this was  
happening - no trouble with its menus or buttons. Strange.

Graham
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Graham Samuel / The Living Fossil Co. / UK and France