User role issue

Hi,

We are using OTM 6.4.2 with two servers.

We are facing an issue, when changed user role for a user, sometimes the user role will be still previous one when user login.

However we can repeat this issue:

1. Change user role for a user from "role A" to "role B".

2. Login OTM using the user account with Mozilla, user role become "role B"(it's correct).

3. Login OTM using the user account with IE.

issue: The user role on IE is "role A", logout Mozilla and re-login, the user role on Mozilla is "role A".

close IE, and try to OTM with