Blender 2.57a (64-bit)

What's new in this version:

Essential Fixes:
- sculpting partial redraw glitch #26932, r36161
- crash on entering 3D text editmode (OSX only) #26930, r36179
- crash on loading 2.4x files #26904, r36148
- loading file with packed audio crashes #26990, r36213
- loading large blend files speed-up r36241, r36244

Rendering:
- black dots with raytrace reflections & bump mapped dupli-objects #26902, r36165
- render crash when tangents are used with modifiers that remove orco coordinates #26933, r36170
- incorrect errors for panorama & orthographic camera combination #26906, r36184
- no output from texture node group #27034, r36251
- crash setting voxel data to negative resolution #27083, r36256
- crash when loading invalid voxel data and resource leak - never closing files #27084, r36257
- wrong sequencer alpha gradient #25713, r36197

Interface:
- top bar 'Add -> Mesh -> UV Sphere + Enter' - crashed #27058, r36242
- buttons with centered text truncating the first characters when there wasn't enough space #26937, r36174
- single grease pencil points drawing very large in the image editor, r36154
- incorrect relative path used when opening audio #26949, r36209
- unpacking sounds with a long ID name #27015, r36214
- ambiguous operator names in the search popup #26977, r36221
- crash copying datablocks with ID Property arrays #26967, r36229
- console is not hidden when start blender #26884, r36243
- outliner objects showed "active" or "selected" in confusing ways #27026, r36248
- freedesktop icons, incorrect install location and copying SVG #27086, r36260, r36261
- sunsky presets used deprecated property names #27094, r36268.
- non-functional user preference for clamping texture #26955, r36186
- smooth tangent iteration field in curve panel not responding #26989, r36198
- text editor indentation correction when when line contained ',' or ':' in a string, r36187
- text editor copy/paste breaks formatting of script #27014, r36236

Tools:
- "make fur" gave errors with multiple selected objects. r36250
- mesh editmode de-selecting edge loops #26931, r36159
- dupli-extrude-cursor added wrong location when nothing selected #27016, r36216
- mesh rip tool access from menu fail #26936, r36226
- crash copying mesh, armature, lattice and metaball datablocks while in editmode #27096, r36263, r36264
- explode modifier - apply as shape impossible #27075, r36249
- add object, localview and undo error #27044, r36245
- buffer overflow with string lengths for operators that took ID names, r36219

Compositing:
- 'Hue Correct' composite node saturates #26945, r36201
- 'Displace Node' composite node crashes Blender when connected to Z-Buffer #26896, r36202
- lens distortion composite node delivered RGBA out with alpha zero #26901, r36212
- timeline camera switch failed with compositor renderlayers #26900, r36217
- rendering non active scenes from the compositor used wrong frame, r36218
- modified nodes inside edited groups not updating the view #27018, r36227

Python:
- bpy.context.object.collision access crash #26995, r36204
- crash running the transform operator from python #27011, r36215
- button input could do incorrect unit system replacements of valid python expressions r36199, r36206
- bpy.utils.blend_paths(True) crash #27072, r36246

Game engine:
- blenderplayer wasn't finding bundled python #26951, r36208
- game engine radar sensor broken #26795, r36234

Animation:
- apply scale to armature offset bone children #27006, r36211, r36233
- action/NLA editor issues with animation data context #25960, r36222
- particle group object viewport and render scale mismatch #27008, r36224
- action editor header doesn't update when entering tweakmode on NLA strips #25960, r36225
- bugs when linking particles/collision/softbody modifiers #27038, r36228
- separate armature would also separate active, unselected bone r36232
- available keying set fails in armature pose mode #27090, r36258
- b-bone doesn't resize correctly with numeric input #27095, r36270

- Additions
- API for exporters to write paths with different absolute/relative options. r36155
- image and compositor now show the color under the cursor as well as HSV and luminance. r36239

Blender Addons:
Fixed:
- Add Corrective Shape Key: api update. r1830
- Fracture Tools: api update r1835, r1836
- Povray render export fix for writing invalid names r1842.
Unreal Engine (PSA / PSK):
- fixed mesh rebuild for face id materials and vertex groups. r1839
- fixed vertex group support r1844
- fixed uv's and tri and quad mesh rebuild button r1832
- View3D Copy Menu: fixed for new api r1845
- 3DS Import: support for files which reference non-existing materials. r1846
- OBJ Import: loading when in pose mode failed #27019, r1848
- RenderFarmFI: Added guidelines for submitting the render and fix error where hasSmokeSimulation lacked parenthesis r1850
- Add Mesh Extras: missing argument to menu operator r1850

Additions:
- added OBJ & FBX options for exporting paths - relative/absolute/automatic/copy-file/strip-path r1828