When I click on the 'commerce' tab and scroll down the menu to 'search shops', I only see a blank page with a link to the cash shop so I can remove that add.

I haven't really been active on this site for a few months and I'm sorry if I missed anything or this is already resolved.

Do you have any customcss?

I did (the CSS was merely a fixed colored box for floating items, i.e. flowers, etc.) and removed it and tried to search again. It did not work. I got the same page.

Hm. What about browser add ons like adblock?

Oh, I got it now! Thank you. I'm sorry for the confusion. I try to browse very safely and so use adblock plus, adguard, etc. because I know there were issues with the advertisements leading to potentially dangerous places before on this site. I do buy GA when I can though. Anyways, one of them completely block that entity and I fixed it.

Again, I apologize for the inconvenience, but thank you for your help ^_^

It's no problem at all! I have a few add ons on my browser too to help with security concerns so I understand completely :)