Missing asset box appears even though asset is installed

[hholdenaz]

For some reason, the missing asset box occasionally shows up even though the asset itself is installed. An example of this is on the Settle & Carlisle Route:

Does anybody know how to fix this glitch? The asset is installed, so this box shouldn't be appearing.

 

[JCitron]

Check for anything that might be open for editing. Sometimes, a DBR is needed to fix this.

 

[stagecoach]

You may have the asset installed, but is it the same version number or lower? When a route is saved, it may have a higher version number than you have installed.