I have a few following questions: Which version of CVI and the runtime engine are you using? Are you using the classic or labstyle ring control? Do you create the control programmatically or in the UIR editor? Does the problem appear immediately at runtime or only after a long period of time?
There was a similar issue in CVI 6 as described on the following post. Let me know if this is the problem you are seeing. If not, could you post an example program / screen shots demonstrating the behavior?
There was an issue with the classic recessed menu ring control in CVI 6.0, but this has since been fixed in CVI 7.0. Are you using the recessed menu ring control? If so, as a workaround, you can either:
1. Use the Lab Style Control 2. Use another type of ring, or 3. Create the classic recessed menu ring programmatically
Also, if you open up your 6.0 UIR in CVI 7, replace the ring control with another classic ring control, rebuilt your project and run it, do you see the same behavior?