Sometimes Mail.app doesn't show the body of the mails. It appears just for a second under the sender and the objects but then it disappears.
When I close and reopen the App the problem is fixed (sometimes it requires several relaunches). The body of the mail is also shown if I double click on the mail and open it in a separated window.
I'm using the latest version of OsX and I've installed the plugin Mail Act-On 2.4.2. Mail.app is configured for
How is it possible to fix this problem?