I will come over to Discord if what I am currently trying doesn't work: installing 1.4.2 on a different computer and resyncing the blockchain from the beginning.
In addition to "reset wallet" you probably need to also delete blockchain folder (but leave wallet files that are in there) and start from scratch What I had to do whenever happened to me
Yep, that's basically what I am doing now. I installed the latest version of the wallet software (I was running 1.4.1) on a totally different computer and had it download the blockchain from the very beginning. The only thing I kept from the previous installation is the .dat file for my existing wallet.