There is a warning on the homepage of truecrypt
http://truecrypt.sourceforge.net/
>WARNING: Using TrueCrypt is not secure as it may contain unfixed security issues
More info:
http://www.networkworld.com/article/2342845/microsoft-subnet/encryption-canary-or-insecure-app--truecrypt-warning-says-use-microsoft-s-bitlocker.html
http://www.rawstory.com/rs/2014/05/29/security-enthusiasts-may-revive-truecrypt-encryption-tool-after-mystery-shutdown/
http://www.hbarel.com/analysis/itsec/the-status-of-truecrypt
http://it.slashdot.org/comments.pl?sid=5212985&cid=47115785
Alternatives:
http://truecrypt.ch/ (forking or actually continuing the development)
https://ciphershed.org/ (truecrypt fork)
TrueCrypt's audit in pdf:
https://opencryptoaudit.org/reports/iSec_Final_Open_Crypto_Audit_Project_TrueCrypt_Security_Assessment.pdf