Quite same problem, different soluzione.
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I had this message:
— error —
Warning: getimagesize() [function.getimagesize]: Unable to access […]/wp-content/uploads/logo.jpg in […]/web/lucavanin/wp-content/plugins/register-plus/register-plus.php on line 1531
Warning: getimagesize([…]/wp-content/uploads/logo.jpg) [function.getimagesize]: failed to open stream: No such file or directory in […]/wp-content/plugins/register-plus/register-plus.php on line 1531
— end error —
By FTP I uploaded the file logo.jgp in […]/wp-content/uploads/ and everything work properly.
