iTunes displaying weird characters???

Hi guys, its been a while since I wrote on this forum. Now I come back with a question. To be honest I don't know what the heck its going on. I turn on my Macbook today and everything was working fine, I go and open my daily apps which includes Itunes and I see this <see picture below> does anyone knows what's this or what could be the cause? or even how to fix it? Thank you in advance.




PD. I also notice that now the some of the numbers look bold and sometimes the first letter of a paragraph also looks bold. If you know how to fix it please share your knowledge

Open Font Book > Select the fonts > File > Validate Fonts
Then > Edit > Resolve Duplicates.

If you have installed 3rd party fonts recently remove them. If you have removed system fonts put them back
Best.

Hey Torchy, thank you for the help unfortunately that didn't work . I went to the menus that you said and the option "Resolve duplicates" its disabled. I don't know what's next :S.. BTW I didn't install any 3rd party fonts lately not at least for the last 3 months. Hope you can help .

PD. Help please