I'm afraid this is a user forum. Support do not offer telephone support. The best thing to do is post here in this forum giving full details of the problem, include screen shots if relevant and also quote your OS version and Moneydance version. There are a good few knowledgable and helpful members who may be able to help you out.
The opening balance is a calculated figure, if it has changed from the previous closing balance it means something has been changed in the register. The following article discusses the possibilities towards the end.