Parse: Cannot sign up a user created automatically - ios

Question

I'm using Parse 1.7.1 for iOS and I am trying to sign up a user. I chose to let the user interact with the app before I force the sign up / login process. The problem is that as soon as I call signUp the session object disappears from the server and causes any subsequent calls to return error 209.
Here's some code:
AppDelegate:
[PFUser enableAutomaticUser];
[[PFUser currentUser] incrementKey:#"runCount"];
[[PFUser currentUser] saveInBackground];
When I check the Parse Core console I can see a valid User & Session.
MyController:
PFUser *user = [PFUser currentUser];
if (! user) {
user = [PFUser user];
}
user.email = #"my#email.com";
user.password = #"somepassword";
user.username = #"whatever";
// I also tried Save instead of signUpInBackground... same result
[user signUpInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (succeeded) {
NSLog(#"Success signing up");
}
else {
NSLog(#"Error %#", [error localizedDescription]);
}
}];
When I check the console there is an updated user but there is no Session anymore.
Any other API call
[Error]: invalid session token (Code: 209, Version: 1.7.1)
Despite the fact that the callback returns success as soon as I try to interact with the Parse API I get a 209, invalid session token. This is fair enough, since the session object is not present in the console.
Does anyone know what I am doing wrong?
Note: this a brand new app (not affected by the change made by Parse on the 25th of March)/.

Answer 1

I have raised this as a bug with Facebook and they are fixing it in 1.7.3
Here's the conversation I had with them.

Answer 2

Create button with selector -signUpSelector. And need implement this code:
-(void)signUpSelector
[PFUser becomeInBackground:#"session-token-here" block:^(PFUser *user, NSError *error) {
PFUser *newUser = nil;
if (error) {
newUser = [PFUser user];
} else {
newUser = user;
}
user.email = #"my#email.com";
user.password = #"somepassword";
user.username = #"whatever";
[user signUpInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
if (succeeded) {
NSLog(#"Success signing up");
}
else {
NSLog(#"Error %#", [error localizedDescription]);
}
}];
}];