This evening I ran into a problem with starting excel or more precisely
opening workbooks.
I was writing some code in an addin I am developing. As close as I can
recreate the problem it went something like this:

I opened MyAddin which automatically opens MyFile. I created a new Forms
command button on MyFile and opened the dialog to assign a macro. Since the
target macro is in MyAddin it didn't show up on the list (as expected). I
typed in the macro name (BUT critically, I think I forgot to enter
"MyAddin.xla!" to fully qualify the location of this macro). When I clicked
the button, it started another addin (Rob Bovey's VBA CodeCleaner) which
crashed in mid procedure.

I'm not sure how started this sub but I suspect that lacking a fully
qualified assigned name, my button click caused the program to search thru
all available addins til it locates one with the name I assigned to the
button.

The problem now is that the above mentioned crash seems to have left some
excel setting modified (which I assume would have been re-set if I could have
completed the CodeCleaner procedure).

The current symptom I am having is that whenever I click on a workbook icon
in the desktop or wherever, an instance of Excel is opened but the particular
workbook does NOT open. (I get the same blank grey screen that I get whenever
I close all workbooks, but have not closed the xl program.) I can then use
FileOpen and find the file again and open it, or click on New to open a new
wbk.

So, the question: Is there a way to re-set some property of Excel so I can
directly open files from the window icons?

TIA