5. Troubleshooting

If something isn't working as it should, before you try anything else, check to see whether there is an update available for OneCommander.

Shortcut key isn't working

This could be because it's being intercepted by another app, which can be tricky to track down. Windows allows apps to list the system-wide hotkeys currently in use, but refuses to identify which applications are using them. A utility called Ethervane ActiveHotkeys (portable), which may not be supported any more, lists hotkeys currently in use by Windows. Then, by closing down apps one by one you should be able to identify the culprit.

Filename not accepted

The following characters are not permitted in Windows file names: 
<>:"/\|?* 
More information on file naming can be found here.

Some folders, e.g. C:\Users\<user name>\AppData, not visible

Make sure that you've checked all the "Visibility" options in Settings > View.

OneCommander won't start

OK, we get the irony: if you can't start the app, how can you read this? Except that there is a copy of this manual at OneCommander.com, which is presumably where you're reading this now. Here are three approaches, starting with the simplest and ending with a restart that involves losing your settings.

Approach 1: The Main Window may be hidden off screen. Try pressing Shift+F1 to bring it back into view.

If that doesn't work:

Approach 2: OneCommander may be "frozen". Open the Windows Task Manager, click on the Processes tab, and search for any entries for OneCommander, either in the Apps or Background Processes sections. If you find any, select them and click the "End task" button at the bottom right-hand corner of the Task Manager window, or right-click on them and select "End task". Try starting OneCommander.

If that doesn't work:

Approach 3: There may be a problem with OneCommander's main settings file.

1. Find the Settings folder (e.g. C:\Users\<user name>\OneCommander\Settings\).
2. Rename the file "OneCommanderV3.json" to something else, for example "OneCommanderV3.json.deactivated". This file will be recreated when you get to Step 4.
3. Open the Windows Task Manager, click on the Processes tab, and search for any entries for OneCommander, either in the Apps or Background Processes sections. If you find any, select them and click the "End task" button at the bottom right-hand corner of the Task Manager window, or right-click on them and select "End task".
4. Try starting OneCommander. If it works, great! However, you'll need to go through your Settings again, because they will have been reset to OneCommander's default values.

Something is spamming your filesystem with file changes errors

If a program is constantly changing many files at once the buffer that holds filesystem changes may get full and OneCommander will miss changes on disk. It may also degrade the life of your SSD (solid state drive). Go to Settings > Advanced for a utility that will help you identify the offending program.

When maximized on a two-screen display, the Main Window spreads slightly on to the second screen

This is an unfortunate feature of the third party library that renders the Main Window. The only fix available is to turn off the Acrylic window effect in Settings > Theme, shut down the program and restart.

Drag and drop not working with other programs

If you can't get another program to accept a file dropped when you've dragged it from OneCommander, try selecting "Use old Drag & Drop system" in Settings > Advanced.

Wrong program opening file

File associations are controlled by Windows - OC just tells Windows to open the file and doesn't say which program to use, so WIndows is the one making the decision. 

Try right-click that file, Open with, choose some other program, tick to make it as default, restart PC, repeat the process but select the program you want.

This is more common issue with Microsoft Store version of OC. If this doesn't work, install the MSI version instead

If none of that helped...

Please email [email protected] or go to the support forum at Google Groups.