Hello,
Here with a very similar problem.
First I transferred 5000 siacoin from bittrex to sia's wallet, and they did not appear. Guilt mine, the wallet was not synchronized.
I synchronize the wallet and the coins still do not appear. Then the wallet says it needs to be updated. ok, update then.
After all the day updating gives me the same error as you.
The coins are still lost, although the transaction appears complete.
Please, people of Siacoin, give us a solution to these problems.
I invested in your project because it seemed to me to be the most interesting and with a great future. But I think if you do not give us a solution and fix these problems with the wallet and the transfer of coins your project is going to stay in a BLUFF. Soon the problems that investing in Siacoin is giving rise to will spread among the people and we will go with our money elsewhere.
I expect response and solutions as soon as possible.
Thanks and regards
P.S. the wallet is still trying to update without success