New Skyrim patch details.

UPDATE 1.5 (all platforms unless noted)

NEW FEATURES

    New cinematic kill cameras for projectile weapons and spells
    New kill moves and animations for melee weapons
    Shadows on grass available (PC)
    Smithing skill increases now factor in the created item’s value
    Improved visual transition when going underwater
    Improved distance LOD transition for snowy landscapes

BUG FIXES

    General crash fixes and memory optimizations
    Fixed issue with Deflect Arrows perk not calculating properly
    In “A Cornered Rat,” the death of certain NPCs no longer blocks progression
    Fixed issue where Farkas would not give Companion’s quests properly
    Fixed crash when loading saves that rely on data that is no longer being loaded
    Followers sneak properly when player is sneaking
    Fixed issue with weapon racks not working properly in Proudspire Manor
    Arrows and other projectiles that were stuck in objects in the world now clean up properly
    Fixed issue where “Rescue Mission” was preventing “Taking Care of Business” from starting properly
    Fixed issue where certain NPCs would fail to become Thieves Guild fences
    Fixed issue in “Diplomatic Immunity” where killing all the guards in the Thalmor Embassy before starting the quest would break progress
    In “Hard Answers,” picking up the dwarven museum key after completing the quest, no longer restarts the quest
    Killing Viola before or after “Blood on the Ice” no longer blocks progression
    Fixed issue where Calixto would fail to die properly in “Blood on the Ice”
    In “Waking Nightmare” fixed occasional issue where Erandur would stop pathing properly
    Fixed issue where letters and notes with random encounters would appear blank
    Fixed rare issue where dialogue and shouts would improperly play
    Lydia will now offer marriage option after player purchases Breezehome in Whiterun
    Fixed issue where if player manually mined ore in Cidhna Mine, jail time would not be served
    Fixed rare issue with skills not increasing properly
    Fixed issue where the Headsman’s Axe did not gain proper buff from Barbarian perk
    In “A Night to Remember” it is no longer possible to kill Ysolda, Ennis or Senna before starting the quest
    Fixed issue with the ebony dagger having a weapon speed that was too slow
    Fixed issue with “The Wolf Queen Awakened” where backing out of a conversation with Styrr too soon would block progress
    The third level of the Limbsplitter perk now properly improves all battle axes
    Fixed a rare issue where Sanguine Rose would not work properly
    In “Tending the Flames” King Olaf’s Verse will no longer disappear from explosions

source

This should be up already for PC with PS3 and X360 to follow once approved by Sony and Microsoft.

Good to see they are still working to improve the game experience.

That sounds very strange indeed.

Have you tried trying to delete your game data (*not* save data, saves will be fine) and reinstalling? Could be a corrupt file that has something to do with water/player physics in water.

Other than that, no idea. Not something I've ever come across.

Unless it's just that your character doesn't like swimming