Required software development freelancer for Roundcube broken - can you help me fix it? job

UPDATE: I posted this request, but it expired... so I am posting it again - this is a definite gig:

Last week, I upgraded my CentOS system's PHP on my VPS.

But:

That upgrade broke my RoundCube connection... I can no longer log in. Instead, I get this error:

Invalid request! No data was saved.

I am sure this is something simple for someone who knows what they are doing.

Can you help me fix this problem?

Also, I get this error message when I try to log into my mySQL database via SSH:
ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

Looks like I need to reset the mySQL root password... can you help me with this, too?

Skills & Expertise Required

software development