Yeah well weird !
So did what you said, got a new chain loaded swapped me wallet.dat & fails to load.
says" Error initalizing database enviroment C:\users\****\appData\roaming\SHROOMS! To recvover, BACKUP THAT DIRECTORY, then remove everything from it except wallet.dat."
Did you extract files from blockchain zip archive to C:\users\****\appData\roaming\SHROOMS ? Usually this error may appear when wallet started for the first time when blockchain database files not there yet.