We are on a completely new spork, you may need to rebuild your index since you launched on an old fork, if that doesn't work, you might have to sync from scratch.
In Tools, Wallet Repair, select rebuild index, should take overnight, if that doesn't work, you need to sync from scratch. You can choose to do that second part first. I like a fresh sync.
How to sync from scratch? Thank you !
ether use "tools" (erindex /resync)
or
quit wallet
go to data folder - erase blockchain +peers
start wallet - will resync from 0
data folder - Do you mean the %appdata%\roaming\Dashcore?
what is "blockchain +peers"?
What OS are you on? The folder that contains blockchain folders on Windows it is %appdata%roaming%Dashcore . Rename or delete all but wallet.dat and relaunch with correct version, it will generate all new folders and files.
sorry am not a PC guy (Mac only here)
best to wait for AgnewPickens to answer