If you can provide the MapPress version you’re using, a sample URL illustrating the problem, and the shortcode you’re using for your mashup that would be helpful.
I’m having a similar problem. The URL for my development mashup page is http://dev.wordsmith-communication.co.uk/local_contact_category/food-and-drink/ the shortcode I’m using is [mashup].
I looked at the page and it seems the ‘tooltips’ option is set to false. You can control the option in the MapPress settings screen or the shortcode – you probably just need to turn it on.
If that’s not the problem, though, let me know and I’ll take another look.
I did have the tooltips setting turned on in the MapPress settings screen already. I added the tooltips=”true” to the template tag shortcode as below. It’s all working now – many thanks.