When you installed Money Sunset did you also apply the patch described in the first sticky in this forum?
http://social.microsoft.com/Forums/en-US/d28d6921-1f01-430f-b33e-f5a3ec47077b/money-plus-bug-and-solution-mnyob99dll?forum=money
If not, I would try that first. Please let us know if that helps so that others can benefit from your experience.
If it doesn't help, post back with the version of Windows you are using and maybe someone familiar with currency conversion issues will have another suggestion.
Bill Becker