symfony 1.0.13 has been released to fix an important bug in the tag helper.
Strings were incorrectly escaped due to the change r7900 the 1.0.12 release. The missing regression test has now been added and the bug is fixed. The 1.1 branche has also been updated.
Here is the changelog :
* r8176: Fixes #3206 - Simple quotes are no more escaped by Tag helper escaping
* r8045: 1.0: added warning to sfPropelUniqueValidator (refs #2467)
We do advise you to update as soon as you can.