Lots of mod-related bugs were introduced with 1.5. I really don't understand why Bethesda doesn't test their patches with at least a few common mods installed (like ANY player house installed would have found the BIG bugs in 1.5).
Bethesda patches the Vanilla Game. They will do what they need to do to fix the issues in the original game, not a modded one. However, the patches now go through beta so that most active modders update their mods during that period. Even with that, it is up to the mod user to update their mods and adjust any mod mix issues with each patch.
You can participate in the beta if you want to preview any mod issues with an upcoming patch.
I have found a HUGE bug in Skyrim after 1.5. I cannot go into water that is deep enough for me to go underwater because if I do it immediately freezes, and I have to turn off my PS3 and turn in it back on. I even tested it by purposely running into the water, and it froze so is anyone else experiencing this? This bug is a huge game breaker since I cannot complete the DB quest because I have to swim to the ship. Bethesda if you read this can you please fix this.
See the third post in this thread, it applies to all platforms. Note, you may not need to delete and reinstall the whole game, just the update. But otherwise follow those directions.
http://www.gamesas.com/topic/1364404-15-blues-solutions-help-im-on-console/