App.doc not working anymore - stuck, please help

Question

I'm fairly new to javascript development inside Acrobat. I had a set of working folder-level scripts that created buttons. Using Acrobuttons, I set them up using this type of pattern:
var oButton =
{cName: "testButton",
cExec: DoCmdTest,
cEnable: "event.rc = (checkValid())",
cMarked: "event.rc = false",
cTooltext: "try again!",
nPos: -1,
cLabel: "Try again"};
where the checkValid() function was defined above, something like this:
checkMyValid = app.trustedFunction(function(){
          if (app.doc == null) {
                    console.println('it still thinks it is null');
                              return false;
  // other checks here to see if the button should be enabled...
  // in which case they return true;
  // otherwise:
   return false;
This was all working fine, until yesterday. Suddenly, app.doc is null every time. And if I use app.activeDocs[0], same result.
Yet when I use the console with a document open, app.doc and app.activeDocuments[0] both return my document.
Has anyone experienced this?
Thanks,
Jack

Answer 1

What OS, OS version, product, and product version are you using?
Have you updated anything?
Was an automatic update applied?