I was hexed by a Warlock in SE. Drank potion to cleanse Blind/Deaf. No effect.
Edit: To be absolutely specific
Warlock in SE casts the spell "Blindness/Deafness" on me
I fail the save
Become afflicted by the spell "Blindness/Deafness"
Drink two "Potion of Restored Senses" which has the effect of the spell "Remove Blindness/Deafness"
Potion does not remove the status effect applied by the spell "Blindness/Deafness"
What do you mean hexed?
Try to give as much technical details and official names of spells or otherwise abilities for bug report, as it helps to identify what happened, and therefor if something is a bug, or why it didn't work if it should have.
Edit for clarity
If I recreate the bug I'll make a shadow play clip and/or save the combat log