Hi klisanor,
too bad that my plugin isn´t working for you – I just wonder which steps you have taken in order to analyse the issue here (I couldnt find a corresponding support ticket in the forum).
I´d be willing to help you find the real issue a solution here (in more than 90% of all support cases the issue is another incompatible plugin, theme or hosting issue).
Anyway: I would need more details to be able to help you – please have a look at http://mapsmarker.com/readme-first which gives you a guideline on how to analyse issues with my plugin.
If it is possible to get a temporary admin access for your site, I can also have a look directly if you like (send access data to info(a)mapsmarker.com).
looking forward to hearing from you!
Robert