After the upgrade to Cityworks 15.4.2, the first time accessing the Cityworks Map could look wrong. Kind of like this:
To fix this, you simply need to clear your browser cache in Firefox. To do so, open the Menu in the top-right of the screen and click Options:
From here, go to Cookies and Site data in the the Privacy & Security section here:
Click Clear Data and make sure both checkboxes (Cookies and Site Data as well as Cached Web Content) are checked:
Click on Clear to finish the cache clearing process.
Now close/reopen Firefox and reload Cityworks. The displays should look the way they are supposed to: