I might do some more testing to see if there's a problem lurking in the farm when you have a higher population. My tests were all done with a lower population.

Is there any way to get around this crop bug in v1.0? I have played for more than a day and don't want to install v1.1 and wipe out my current game.

I never experienced a problem with crops the entire time I was testing and playing v1.0, so I can't say for sure what might get you around the problem. The reports of difficulties were rare. You might try to leave your game running on AC power to see if the farm straightens itself out and starts producing regularly again. I've found that in v1.0 the villagers are far more productive when the game is left running than when it's turned off.