by Axel on Mon Aug 05, 2013 2:26 pm
As silly as it sounds, there is no mechanism to reset the access credentials stored in FPV Pro at this time (we must think of something, like a "Reset credentials" button on the plug-in's About page).
In the meantime, here is a (little barbarian) fix: using regedit.exe, navigate to
HKEY_CURRENT_USER\Software\ARSD\FastPictureViewer\Publishing\Plugins\{23B2FD19-6B49-489D-B186-F821E1A94241}
You will find all the 500px plugin's parameters in there, notably a value named 'PrivateStream' which contains your authorization credentials, strongly encrypted.
Just erase this value (right-click its name and click Delete) and the plug-in will ask for a new authorization the next time you use it.
As a side note, your password is *not* stored there. In fact, FastPictureViewer never had your 500px password as the authorization is made on the 500px site itself: what we store is the authorization token created by 500px and which can be revoked from the 500px.com website just like you'd un-authorize any other app.