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First, you will not lose any cue point information by reinstalling Serato DJ or by updating to the latest version.
Second, since it works with your friend's computer, it sounds like it's your computer and not the controller that is having the issue. I think you may have tweaked some of the MIDI settings. You should try reverting to the default MIDI settings.
This is from the Serato website:
Reverting a mapping
If you have made a mistake while making a MIDI mapping, click the mapped Serato DJ control and press the ENTER key while the blue mapping box is showing and the specific mapping will be reverted.
If you want to revert back to the standard Serato mappings for your primary device you have two options.
- You can turn off the "Allow Serato Hardware Remapping" option in the MIDI tab of the SETUP screen, this will keep your current MIDI .XML loaded but will only disable custom mappings to your primary device. This is good if you have mappings for a secondary controller you want to keep, or..
- You can click the 'Restore Defaults' button which will prompt you to save any custom mappings you have made and will unload your current MIDI .xml leaving you with a clean slate.
If you have already made custom mappings for third party MIDI devices it's best practice to back-up existing mappings before you begin remapping your primary device. Make sure to save your favourite mappings! Unsaved mappings will be cleared once the software is closed.
Clicking the 'Restore Defaults' button will wipe mappings for any device saved to that XML. If you have two devices connected at the same time, both devices will be restored to their default mappings.