What would cause my wallet to lose it's password?

[Vod]

I'm using the standard Bitcoin Core 0.9.2.1.

I had a strong password on there.  Then I decided to move Bitcoin off my SSD onto my Drobo.  I couldn't get it to work so I ended up downloading the entire blockchain, with my original wallet.dat

After the blockchain was up to date, I went to check my password and there was no password set!

How could this have happened?

[hua_hui]

Remember to copy the whole blockchain data including bitcoin.dat

[Vod]

Remember to copy the whole blockchain data including bitcoin.dat

I actually copied the entire directory over.

[leozzo]

If you use windows:

C:\Users\YOURPROFILENAME\AppData\Roaming\

Here you will find all your WALLET directory and file

[shorena]

I'm using the standard Bitcoin Core 0.9.2.1.

I had a strong password on there.  Then I decided to move Bitcoin off my SSD onto my Drobo.  I couldn't get it to work so I ended up downloading the entire blockchain, with my original wallet.dat

After the blockchain was up to date, I went to check my password and there was no password set!

How could this have happened?

Just so I understand what happened:

You had walletA (encrypted) on computer A and copied that with the blockchain and all other data on computer B.
Now you have an exact copy of walletA on computer B, but its not encrypted?

Are you sure its the same wallet? Maybe bitcoin core made a new wallet. Are the addresses the same, does your TX history still show? Are the notes to the addresses still there?

[Vod]

Just so I understand what happened:

You had walletA (encrypted) on computer A and copied that with the blockchain and all other data on computer B.
Now you have an exact copy of walletA on computer B, but its not encrypted?

Are you sure its the same wallet? Maybe bitcoin core made a new wallet. Are the addresses the same, does your TX history still show? Are the notes to the addresses still there?

Yes.  I basically copied the folder on the C: drive over to the B: drive.  Ran bitcoin core from the B: drive and it had to rebuild the blockchain.

It's the same wallet.  All my TX history, Receiving addresses, Sending addresses....

Suddenly my wallet was no longer encrypted!

[Vod]

You know what, it's possible I removed the encryption in the past and just forgot.  I haven't sent coins since the middle of August.

I can't see how a file could suddenly decrypt itself.   

Thanks for your help, Shorena.

[shorena]

You know what, it's possible I removed the encryption in the past and just forgot.  I haven't sent coins since the middle of August.

I can't see how a file could suddenly decrypt itself.   

Thanks for your help, Shorena.

Uhm, you are welcome. Not sure what I did. If the file indeed magically decrypted itself that would be a serious issue though.