First of all make sure that you are using the latest version of the app. You can find any possible new release in Updates in the Mac App Store app on your Mac or with Check for Updates... in the Lingon X menu.
Then you can try to move the app to the trash and redownload it to make sure that something in the app is not damaged.
Then you can look at the help for each application, you can find these here on the site:
Some problems can be caused by corrupt preferences. You can fix this deleting the old preferences. You do this by writing a simple command.
Quit the app and open the Terminal app in /Applications/Utilities and write the following command for your app on one line and then press Enter.
|Smultron 6||defaults delete com.peterborgapps.Smultron6|
|Smultron 5||defaults delete com.peterborgapps.Smultron5|
|Smultron 4||defaults delete com.peterborgapps.Smultron4|
|Smultron 3||defaults delete com.peterborgapps.Smultron|
|Lingon X||defaults delete com.peterborgapps.LingonX|
|Lingon 3||defaults delete com.peterborgapps.Lingon3|
|Lingon 2||defaults delete com.peterborgapps.Lingon|
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