Oracle Database Discussions

Hi,
We have a situation where the partition that stores our redo logs became filled. We since cleared enough space and logs started shipping from primary to standby. However, they are not applying. I've tried shutting down and starting the standby database but that didn't work. I've also tried removing the log where application stopped and copying over from primary, no success. I've confirmed that there are no gaps existing.
Could anyone offer some ideas as to how to resolve this problem as we have a scheduled switchover for tonight.
Thanks,
Lia.