Learn Spanish (Latin America): Gracias a ti, no hay problema.

In Spanish, after prepositions like a (to), de (of/from), and para (for), you have to use special prepositional pronouns. For the informal "you", that pronoun is ti. You can't say a tú because tú is only used when "you" is the subject doing the action (like "You speak").

Can I use gracias a to say "thanks to" for things as well as people?

Yes! Just like in English, gracias a can be used to credit a person or a thing for a situation. For example, you can say gracias a ti (thanks to you) or gracias al clima (thanks to the weather).

I remember learning that hay means "there are". Why does it mean "there is" here?

The word hay is very flexible because it means both "there is" (singular) and "there are" (plural). Because problema (problem) is singular in this sentence, no hay simply translates to "there is no".

Why isn't there a word for "a" here, like no hay un problema?