I see many people reporting this problem but I don't know why it is happening. All applications work fine on my device from the first moment after the OTA update. The steps I followed were these:
1) While still on beta 4, I created a backup using iTunes and cleared all settings and content on my iPhone (before doing this, the beta 5 OTA update was not showing and it was saying that my software is up to date)
2) The beta 5 update appeared at the OTA update option and I installed it
3) Restored the backup through iTunes
Now all applications, games and content are there and not crashing.