I`m having the exact same proboem! I used to use SolCalendar and DigiCal without issue. It seems that current repeated events (birthdays) remain, but if I edit them or try to create new ones, the events show up in my Google Calendar online, but not on my apps (Business Calendar 2 NOR my stock Google Calendar app!).
If I edit the events on my calendar online to be one day events only, they show up on my calendar, but if I switch them back to repeated events, either through my phone or online, they disappear from my phone.
Anyone with any fixes would be greatly appreciated.