The help desk told me it was IE too. The SIL was going to put Chrome on but it already was. He just put the icon on so I could get to it and made it my default browser.
We are sorry you have had such an problem with the Private Messaging here on OH
We had a handful of reports of this issue, and our research has shown it's an IE and or Yahoo issue (as the member said). The easiest way to fix it, is to download Firefox or Google Chrome. If you do not want to down load them here are a couple of suggestion we found when googling the problem.
If you have need any help you can contact us at [email protected]