Hi,I believe you tried to clear your browser caches, and tried different browser's (legacy chrome versions don't show some buttons from my experience).
Normally if you like to "upgrade" your controller to 8.x from 6.5.x, you should do a clean installation.That's the savest way, I think.I never updated a standalone controller directly from 6.5.x to 8.x, may this can cause GUI errors.
But aruba also provide a migration tool.If you want to upgrade a classic master/standby or a standalone deployment, from my experience this would be achieved quickest with the migriation tool for aos 8.3.Don't use the tool for 8.4, because the GUI will break also.
After the migration to 8.3 you can go to 8.6.x or 8.7.x.
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