"Updating Notifications Type: Invalid value"
This error should be fixed now, thank you for the report.
I have tried using addresses from different wallet clients and different computers and also one sent to me from someone else but I still get the same result.
I posted a reply to your other post. Where are you copying the addresses from?
Unknown error pushing transaction
Some User's have been getting the error "Unknown error pushing transaction". This means the transaction was broadcast but was not relayed back by any other nodes. It normally happens when you try and spend an unconfirmed transaction which hasn't propagated well throughout out the network (e.g. has incorrect fees, double spend etc). Confirmed outputs will now be prioritised over unconfirmed outputs (previously outputs were picked in ascending time order). Also transactions with poor propagation will be re-broadcast with greater frequency.
You can check if a transaction has not propagated well by clicking the red unconfirmed button:
And looking at the mining nodes which have received it: