Exec format error. Binary file not executable

Good day, please help me with this problem - all executable files on freebsd FreeBSD 9.2 x64 don't work with error
Code:
Exec format error. Binary file not executable
Even mc reboots. This problem starts when I add disk ada0 to mirror RAID - it was my mistake - I want to use ada1, right now all executable files don't have an executable bit. Please give me advice - what should I do, except a full reinstall?

Thanks in advance.
 
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