Concerning recent updates to web mapping applications like GMap, ArcGIS and others; browser cache-ing can be problematic. If problems occur try clearing your browser cache, then close and restart your browser and see if this fixes the issue. If not, please send an email to firstname.lastname@example.org to report the problem.
Google Chrome users may install an extension that makes this process simple. Simply connect to https://chrome.google.com/webstore/detail/clear-cache/cppjkneekbjaeellbfkmgnhonkkjfpdn?hl=en and follow the website instructions to install the extension.
Loading this extension into Chrome gives you a little button in the top right of the screen that you can click whenever you want to “clear your cache” — be sure to make the settings only clear the cache, not cookies or history or any of the other things (see settings screenshot below). Once you have it set up you may click at will.