Hello,

Have you checked the project's activity log and review access permissions? Because any recent activities or changes that might indicate the deletion of tasks.

Of course, yes. There wasn't any acitivity in the last days.

And we have to make shure that this won't happen again, because we depend on e reliable and stable project-tool.

At this moment we don't know how the tasks have vanished and how to avoid this in the future or at least have a LOG where we can see what exactly happend.

Is there a third party that intentionally destroys your project?

Based on search results from the OpenProject Community forum, it appears that there have been reports of tasks disappearing or being deleted unexpectedly in version 12.5.1 of the OpenProject software. Some users have reported that they are unable to see any activities or filtered tasks related to the vanished tasks.

It is unclear from the limited information available what specifically is causing the issue or how widespread it is. However, some users have suggested that it may be related to a bug or issue with the software.

If you are experiencing this issue with OpenProject 12.5.1, it is recommended to contact the OpenProject support team for assistance. They may be able to provide guidance on how to recover the vanished tasks or offer a solution to prevent this issue from occurring in the future.

So far, we have no idea what happened to the tasks or how to prevent this from happening again, or even whether a LOG was kept. An investigation of the OpenProject Community forum reveals that users have complained about tasks mysteriously disappearing or being removed in OpenProject 12.5.1. Some customers have complained that they can't find any trace of the supposedly deleted tasks, either in their activity feed or in their filtered list of tasks.

I know we "lost" approximately 30-50 Work Package tasks (and the associated Projects) earlier this year ...we are not sure how or when they disappeared also. We found them in an older copy of OP (12.2.2) but there does not appear to be an easy way to import the missing data into our current instance (12.5.7). The "lost" data were in some specific projects that also disappeared.  

We only discovered the issue when we did "year end" reporting of projects/tasks and found the data gone.

In TestNG (Test Next Generation), which is a testing framework for Java, version 12.5.1, there isn't an explicit concept of "vanished" tasks or tests. TestNG primarily focuses on the execution of test methods, suites, and the reporting of test results.

The performance of the apps has significantly improved when I updated to OP 12.5.1. I got into an odd issue with "missing" tasks. After the upgrade, it appears like several of my tasks have vanished.