It would help greatly if you could let us know what version of Opus you are using, and what your computer environment and OS is. By going into your Profile (see link towards the top of the page, you can set up a signature (like I and many others have done) thereby attaching this info to every post.
In addition (I'm asking a lot, aren't I
) is is possible for you to post an example of your problem?
I've never come across this problem, and it's just possible that the additional info might help someone come up with a solution for you.
HTH