Extensions
If you cannot use extensions, such as Spatial Analyst or 3d Analyst, make sure they are turned on by going to Customize >> Extensions.
![](//libapps.s3.amazonaws.com/accounts/108800/images/extensions.png)
PostgreSQL
If you cannot connect to a PostGreSQL database, make sure these DLL's are installed: PostgreSQLClientLibs.zip
Menus Open Far from Click
If your basic interface is messed up, for example, if a menu appears far away from where you click, make sure your Windows Display Settings are set to "medium (default)". This happens especially with 4k monitors.
![](//libapps.s3.amazonaws.com/accounts/108800/images/display.png)
ArcGIS Desktop Crashes
ArcGIS Desktop does not play well on 4k monitors with certain video cards. If ArcGIS Desktop crashes when your window is full-screen or larger than 2000 pixels wide, try lowering your display resolution to 1920x1080 or smaller.