I'm using SS 2.3.7. My IP did upgrade Debian (there is php 5.3.1 version).
Log-in to the SS not works yet!

Has anybody good idea how fix it?

Thanx.

I'm using NuspherePHPEd for developing and debuggin too.

I see where is problem maybe.
Security::encrypt_password, at line: 855

// Convert the base of the hexadecimal password to 36 to make it shorter
// In that way we can store also a SHA256 encrypted password in just 64
// letters. $password = substr(base_convert($password, 16, 36), 0, 64);
//php 5213, password is OK: df1fgdqrznk0c084g00k4cckcsogoww
//php 531, password is BAD: df1fgdqrzm08w0cssoc8g0o8ogkww0w

I wrote ticket to as #5454, but I cannot realise patch see #3665 and #3004.