Yes, there was a huge errata in Tome & Blood (also found in the Psionics Handbook errata, altho it refers to the psionic power, the text is pretty much the same).
Basically you cannot change forms anymore (only once upon casting).
You are limited to creatures with equal or lower hit dice than your own HD or 15 HD, whichever is lower.
You are limited to creatures, that are not outsiders, undead, constructs or elements (unless you are of that type yourself).
Bye
Thanee