did you ever delete the folder where your wallet file is stored when reinstalling the client?
Just deinstalled 0.5-16, restarted and deleted the nem folder in program files (x86) and reinstalled. but couldn't login.
then I deinstalled 0.5-16 and deleted the folder and installed 0.5-13 and could login into the wallet but
with a different warning: Oops!, ERROR 602, Cannot perform any operations until db is fully loaded.
So I've to wait until the blockchain db is fully loaded? it shows me block 43084 on testnet and est. 5 days behind
but then "NIS info is not available" and it stucks (NIS and NCC are working).
On the landing page it shows me two accounts: beton and NEM. Maybe I created the beton account as a testaccount 2 months ago,
can't remember. I can only login into the account called NEM for which my password fits.
go to c:/user//Nem < and delete the nem folder..
old folder isnt compatible with the new version of beta.. there was a change made with in about a month or so ago that meant old wallet file/address book file is not compatible as far as i remember, so its most likely the old folder that hasnt been deleted that causing you issues.. on live net, if you ever get issues and need to reinstall the client, make sure to save both the wallet file and address book file.. (im thinking/hoping that wallet file and address book file will be merged by launch) i suspect it will as its caused many issues for people...