I have done several checks now. It seems, I had two issues at the same time.

1. Download gaps. I tested your files (3.01 for 32 bit) and (2.70 for 64 bit). I found no gaps and the diagnosis files were ok. I assume really server issues at FXCM these days?
2. Despite the fact that I had now updated .t6 files, I had still errors during the trade mode (64bit). Training and Backtesting worked fine. The history files are stored on Google Drive G:/ folder. And this was working without issues since years .
Now, I hardcoded the history folder in my script (History = "G:\\Meine Ablage\\11.2_Trading_Monitoring\\4_All\\History";) and now it works without issues.

My ZorroFix.ini has this entry: HistoryFolder = "G:\Meine Ablage\11.2_Trading_Monitoring\4_All\History"

Maybe it is an issue with Google Drive, but it works now. We can close this issue at the moment. If I see some further findings, I will report it here. Thank you for your support, you are doing a great job!