Hi,
I had the same issue when installing to v1.8.
To solve this, I added the parenthesis before the semicolon and it worked!
print_string('<input type=\"text\" name=\"title\" size=\"30\" value=\"$thistitle\" />');
~Amanda Hefner
San Antonio, TX
http://www.texasgames.net
http://elearn.nisd.net
http://eclassroom.nisd.net
http://ecomm.nisd.net