I think you misread what Paul has been explaining; I don't think he is being sarcastic or gaslighting, just being bluntly realistic (better that than hypocritically rosy) about the fact that without specific action and computer event cues, the technical team is unlikely to find the source of the problem.

The CTRL+Z issue is undeniably a recurrent issue for many people. But what we still need to find out is how to trigger it consistently, so that the bug-correcting programmers can reproduce it easily in order to find the causes in software and possibly hardware conflicts, hence the following instruction that Paul gave to Adrian Palme 4 years ago:


And also, this input from Sorina Cuibus is highly relevant:


In my case, it seems to happen when I've been working on a project for a long time without closing it, and it's especially frequent when I open one or more additional projects without closing the one that was already open. But I haven't found a way to reproduce the issue consistently for troubleshooting purposes. And I'm working on a corporate computer which has some very specific security and administration-related settings which can also contribute to it.

So, in short, the only way an actual solution could be found is for us all to collectively provide as much details as possible regarding when and how the issue occurs: in what environments, on which kind of computers, in association with what other software, after typing this or that combination of keys, with or without other projects open, whether the project is large or not, what plugins are used at the same time, etc.

That is not gaslighting; that is light seeking.

Any newfound solution to this issue? Just occurred in 2019 SR2. 

Adrian Komiński 

If you have merged segments, this command is disabled. This is by design, due to the potential danger of destroying the underlying source file.

Are you sure it is disabled upon merging segments? I'm not sure I tried it in Trados Studio 2022, but in previous versions, it was not disabled... and the few times I tried it after merging something incorrectly, it indeed caused a fatal error.

That being said, the CTRL+Z issue is not typically related to merging: it just stops working quite randomly. In my experience, it seems to only happen when more than one project is open, and it gets solved by restarting the software and making sure to open only one project... which of course is just an annoying workaround, not an actual solution. 

Louis LaBonté 

If you merge across paragraph breaks, Undo will definitely be suspended. But indeed, sometimes it stops for reasons beyond my understanding.