Can't open a new tab using the little + or ctrl t, have tried the options posted befor, can anybody help?

For the last week or so i have not been able to open a new tab, have looked through a lot of the solutions on here but none seem to have wroked, i have disabled all add ons in the add on manager and removed the ASK toolbar and still can't open a new tab, it is becoming very frustrating! The only way i can get a new tab open is to click on a somewhere and hope it opens in a new window, can anyone help me solve this issue please?

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