We recently returned from 3 weeks in Malta and rented from Hertz.
We had no problems, whatsoever, during the trip and are very familiar with driving in Malta as we are Maltese citizens.
Almost three weeks since we returned and I received an e-mail this morning advising that I had a traffic contravention and would be charged plus an additional 25 euros to my credit card. The company did not provide any back up for their claim and I will assume has already charged my credit card.
I have asked for proof of the contravention but I fear this is a method of charging unsuspecting tourists of a little more money. If I get a response I will update.