Tonight's FarmVille update that included the release of the Bee Hive feature caused quite a problem for many farmers.
After placing the Bee Hive on the farm, most farmers experienced crashing and accessibility issues.
Zynga address the technical issue and suggests the following:
"Looking into a Placed Beehive Causes Screen to Lock
Clicking "Look Inside" from the menu on a placed beehive causes the screen to lock.
The cause of this issue has been identified to be browser related. If you clear your cache and reload FarmVille, you will no longer be impacted.
Clear your browser cache.
If you find your issue in this section, please refrain from creating additional threads unless otherwise specified in the description of the Bugs listed above." (Source: FarmVille Official Forum)