I am attempting to program our proprietary STR750-based PCB using RFlasher 7.50.14.0185. This is a new PCB similar to one we've been making for years that has never had this issue. When we try to program it, the log says:

>Starting Automatic command.
Commands selected: Connect, Erase, Program, Run, Disconnect.
The device is not in Flash mode. The programmation will work but the application will not execute.
Device 1 handled successfully.
1 devices handled. 1 successful. 0 failed.

The application then does not run. What is causing this problem? I assume it's a board problem because the software runs fine on the board's very similar predecessor. Can you give me some insight into what this line in the log means: