I also ran into this problem lately, I haven't find a
solution yet, but I found something in the Microsoft
Knowledge Base about this

http://support.microsoft.com/default...d=kb;ja;820595

The problem is this article is in Japanese, and I cannot
find the same article under the English version and I
don't read Japanese either. Hopefully someone can help,
thanks in advance.

Fred

-----Original Message-----
Has anyone ever encountered error 50290 ("Application
defined or object defined error") when trying to write to
a worksheet containing a 3rd party ActiveX Control?
(i.e., The line 'Worksheets("Sheet1").Range("A1").Value =
1' causes an error.) This error seems to occur
ocassionally and spontaneously. I have tried everything,
but I know I'm not alone. (Search Google for Excel Error
50290 and you'll find several hits - but no solutions.)
Thanks in advance.
.