Can not log out

All, I know this is not old news. Perhaps someone can point me right to the answer.
V8.00.xx.

Certain users consistently (not sure if it varies between PC) can not successfully log out.
One user can not close Vantage. It simply will not close. Clicking the X or File | Exit.

Another user can close the application, but I have to daily clear her session so that she can launch the app the following day.
Most of the computers here do not have this problem though.

Thoughts?
Thanks
Carey
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In the customization tool box, there is an ultracombox ( and some other nice
controls ). How do I add items to the dropdown list, if I don't use data
binding. Is there any documentation besides the "Epicor Tools User Guide"?



Thanks





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