Hi,
as of the long history of this issue, I stuck with version 12.0.0.6468 until now, which worked so far for me. In the mean time this version is fairly outdated.
Now I have a new notebook, wich uses a AMD Ryzen 7 5825U with integrated Radeon graphic engine, running Windows 11 23H2. So I decided to install the actual version 12.6.0.6765 and give it a try. But still I see the same problem. The line edit mode is left after each pressing of the tab key. I have to press the enter key again to type in the next value.
In the past it was mentioned that this is a behaviour with nVidia GPU's but as I use AMD Radeon now, this seems to be not true.
Ansgar, please check this issue again. Several people have this problem, it's not only me. There is even a 2nd thread called "tab edit gone?" but this gives no solution either. If I can do anything to help, identifying this issue (special log files, ...), I am happy to assist.
Have a great day!