You could try an uninstall/re-install of the software and check if that will make a difference. See the instructions below.
Create a backup of your settings using the instructions at the link below.
Uninstall NinjaTrader via the Windows Control Panel-->Add/Remove Programs (XP), Programs and Features (Vista).
Delete the My Documents-->NinjaTrader 6.5 folder. Do not(!) delete the NinjaTrader Backup folder.
Clear your browser cache.
Download and install NinjaTrader at the link below.
Before restoring your settings, check if the issue persists.
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