shaysinches In addition to what crinrict said, how you visit apartments in San Myshuno or Evergreen Harbor if you have Eco Lifestyle, is a bit different than visiting a sim in a house on a residential lot in other worlds. For a regular residential lot where sims live in a house, when traveling, all you have to do is click on the lot once to select it and you're off when you hit the final travel button. For apartments, when there is more than one apartment, which is most of them, you have to click on the building on the map which brings up another graphic showing the layout of the building showing all the apartments in the building. Clicking on one of them will send you to that apartment when you click the final travel button. So, it takes clicking twice to select where you are going before you actually travel, instead of once when you travel to a regular residential. You probably have this figured out already, but I thought it worth posting since you might not have. Entering an apartment to play works the same way. The three penthouse lots work like a regular residential lot once requiring one click to get you in though.
What you said about the apartments displaying blank white bars shouldn't happen. There should be several lines of text there and a portrait of the sims that live there if sims are already occupying the apartment. Since you also said that you downloaded the pack recently, you may have had some sort of internet hiccup during the download which interrupted the download, corrupting a file. To fix that, try running a repair via the EA App or Origin if you are one the Mac OS players still using Origin.