I installed 1.701 which climb to solve CTD on DES SPD RESTR, I haven't test that for long as I think what I see on 767 is good enough though.
But today I just had a flight on 757, I noticed VNAV is broken like some older version pre-1.7:
1.VNAV not able to engage on climb and cruise, if approaching runway not selected.
2.VNAV not follow path on descend when it's in VNAV PATH mode, feels more like VNAV SPO all the time.
3.VNAV could not preform non-ILS approach with G/A altitude set on MCP.
All these 3 issue have been soloed on 1.700, and also not present on 767 1.004
Hope it's just some minor mistake when copying around codes and you could get it back, I'm back to 1.700's sys.dll file for now and it seems works fine.