In T120074#1506667, @BISWizard wrote:

Hello,
please delete the file "MEGA SANDBOX.preset2" from your preset folder - the file is corrupted - and that should fix your issue.

UPDATE:
It appears that using the devbuild actually shows LESS presets than the non dev build.

In T120074#1505328, @BISWizard wrote:

Hello,
the logs shows that some of the preset files are corrupted and can't be processed. Could you please upload them too, I'd like to see how they are corrupted and whether it can be repaired or not.

Ok, I have used the devbuild to see if all my presets are there, but there is no difference in what appears, it's the same presets I had before.
Must be a problem unique to me?I don't know.

In T120074#1505251, @BISWizard wrote:

Hello,
thank you for reporting the issue. I believe that we've already fixed the issue, and the fix is available on our Development branch: https://forums.bistudio.com/topic/140837-development-branch-changelog/page-42#entry3075108

Could you please upload the logs to some file-sharing service and post the link here? I'd like to check whether it is the same issue or another one.