Use Windows 7,
change ebay password,
run standalone app,
change something with you bidding
at program exit the error message
See the logfile '...' for details.
The log file does not exist.
What is up?

If you don't see the log, that's probably because you set permissions so it can't create it.
I don't think is related to your password. If sniping works, you can ignore this message until the next version.

Also, please always include the version of the software you are using then reporting any issues.