I tried and it works for me.
Probably there is another similar text expander active - try to disable it or change the abbreviation to something else.

In which software?
You may need to increase a Key Delay in Preferences/Text Expander/Advanced. Try 10-80ms.

Like in any other application. For example, you can create a new, empty settings file by selecting File/New menu and then add the items. Or you could save the existing file with a different name by using File/Save As menu.

Then you can load a settings file by selecting File/Open menu.

Your shortcut may be running another system process on your computer so it’s not a FastKeys fault.

Restaring Windows would be fine.

FILE macro is inserting a file contents - double click on it to see the file path.

How do you trigger the expansion? By typing "string_example"?
Do you have a Shift selection key enabled in Preferences/Appearance?

If this doesn't help, please contact our mail support.

Does this happen when FastKeys is expanding the text?
Does pressing Escape key helps?
You could also set a Reload shortcut in Prefrences/General/Shortcuts.

Preferences/Text Expander/Ending characters?

Thanks for your suggestions, we will put to the list for possible future development.

1 - You can copy the command contents, create another item and paste. There is also "Copy to start menu" option.

Sorry, I’m not sure I understand what you mean... Can you give me an example?

You must have another item/shortcut using a Shift key - please check. Also, try resetting the preferences to default.