small issue to report: when you have sync issues the wallet will go into a 'safe mode'. The issue is that the debug console seems to not let you do commands when it is in this state. When I type 'upgrade' in the console it gives a safe mode error message code -2 and doesn't execute the upgrade. I think you should still be able to execute the upgrade command at least, even in the 'safe mode'.
Hi,
Yes its due to the bitcoin supermajority rule, if you are out of sync even after you upgrade you stay in safe mode.
There are 2 solutions:
1) The most effective works 90% of the time:
cd c:\program files (x86)\gridcoin
grcrestarter -upgrade
This forces an upgrade. Wait for chain to sync. Safe mode should go away.
If and only if that does not work, then rebuild the block chain (this is usually never required).
Good luck,
Grid