1. QuickInserts error
I have tried both registration methods (from the Start menu and with the batch file), and the problem still exists. The error message continues to pop up when I open the file.
If you didn't create this yourself then it would be worth checking where the TTX came from as Jerzy suggests. Please feel free to send me the TTX and I will happily take a look too - email@example.com
2. Saving target INX
Because I set this up as a project, I assumed all the files would be in the proper place. Just to be sure, I put a copy of the original inx.ttx file in both language pair folders (de-CH and en-US).
As before, the Saving Source Content... dialog box appears, but the application just hangs and I have to go to the Task Manager to get out of Trados.
It isn't the TTX you need in the same folder. I'm referring to the INX itself that was used to create the TTX. If you don't have this because you were only given a TTX by your client then you cannot save the INX.
In Studio it is possible to embed the INX into the SDLXLIFF and then you can always recover the source from the SDLXLIFF itself without needing a copy of the original. But with TTX this is not possible.