> For the complete documentation index, see [llms.txt](https://docs.lightact.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.lightact.com/release-changelogs/lightact-4.13/lightact-4.13.b2.md).

# LightAct 4.13 Beta 2

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This changelog was created on **15 December 2025**. It includes **4 Epics** and **9 upgrades**.

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## Robust Lightsync For 4.13

This epic focuses on making LightAct’s framelocking mechanism more streamlined and robust with better management of various states.

### Improvements

There are 1 new improvements in this epic.

#### LA4-6137: Lightsync Unintentional Kicking Out Of The Session

Implemented mechanism to prevent machines from being prematurely disconnected from LightSync session.

**Status:** *Testing*

***

## Qol December 25

### Improvements

There are 3 new improvements in this epic.

#### LA4-6507: Play Mode Timecode Skipping

<div align="left"><figure><img src="https://lightact.com/uploads/releases/LightAct4/changelogs/4.13.b2/LA4-6507.png" alt=""><figcaption></figcaption></figure></div>

Using 30 fps MTC with a 60 fps timeline in Timecode play mode causes frames 30–59 to be skipped, jumping from 29 to 1 each second. Expected: seamless 60 fps playback that correctly maps 30 fps timecode without frame loss.

**Status:** *Code Review* | **Requesters:** *SUP*

#### LA4-6496: Undo Stack

<div align="left"><figure><img src="https://lightact.com/uploads/releases/LightAct4/changelogs/4.13.b2/LA4-6496.png" alt=""><figcaption></figcaption></figure></div>

Add an Undo Stack menu beneath Redo. Selecting it opens a compact viewer, similar to the Console window, that displays the current machine’s undo history with timestamps and concise command details.

**Status:** *Done*

#### LA4-6476: Better Watches For Integers That Appear As Dropdowns

<div align="left"><figure><img src="https://lightact.com/uploads/releases/LightAct4/changelogs/4.13.b2/LA4-6476.png" alt=""><figcaption></figcaption></figure></div>

Fixed Watch display for integer output pins rendered as dropdowns. It now shows the selected label with its integer value, e.g., “test \[0]” instead of just “test,” improving clarity.

**Status:** *Done*

***

## Mapping Improvements For 4.13

Enhanced CanvasMaps and OutputMaps windows for improved speed and convenience during large-scale events.

### Improvements

There are 1 new improvements in this epic.

#### LA4-6223: Absolute Mappings Instead Of Relative

Improved Subarea mapping reliability by switching coordinates from floats to integers. This prevents off-by-one rendering errors (like a missing 1px on the right edge) when mapping images to Canvas—for example, a 1000x600 PNG with 200x200 tiles. Coordinates are now stored and rendered with exact pixel alignment.

**Status:** *Done* | **Requesters:** *SUP*

***

## Crossfade Upgrades For 4.13

Enhanced crossfade functionalities and workflows for timeline programming.

### Features

There are 2 new features in this epic.

#### LA4-3781: Crossfade Property To Section

<div align="left"><figure><img src="https://lightact.com/uploads/releases/LightAct4/changelogs/4.13.b2/LA4-3781.png" alt=""><figcaption></figcaption></figure></div>

Sections now include Crossfade settings via a dropdown with Inherit or Fade. Choose Fade to set Crossfade time (s); choose Inherit to use Timeline properties. Crossfade time is always taken from the destination (section or layer) only—never combined.

**Status:** *Done*

#### LA4-6343: Timeline Crossfade Property

<div align="left"><figure><img src="https://lightact.com/uploads/releases/LightAct4/changelogs/4.13.b2/LA4-6343.png" alt=""><figcaption></figcaption></figure></div>

Added a Cross-fade time \[s] property to the Timeline, mirroring the option in Layers. Define transition duration in seconds for smoother crossfades and consistent control across timeline items.

**Status:** *Done*

### Improvements

There are 1 new improvements in this epic.

#### LA4-6342: Layer Fade Properties And Crossfade Upgrade

<div align="left"><figure><img src="https://lightact.com/uploads/releases/LightAct4/changelogs/4.13.b2/LA4-6342.png" alt=""><figcaption></figcaption></figure></div>

Layer’s cross-fade dropdown has 2 options: Inherit, which means the Layer’s crossfade is inherited from the section’s properties and Fade where the user has an option to manually set the crossfade property of that layer.

**Status:** *Done*

## Other Upgrades

There are 1 new upgrades in this epic.

#### LA4-6508: Play And Pause Doesn't Progress Across The Section Even After Pressing Space

Fixed an issue where pressing Space at the end of a section did not consistently advance playback to the next section. The playhead paused at the boundary and only sometimes progressed after multiple key presses, even after resizing sections. Playback now reliably continues into the next section on a single Space press.

**Status:** *Done*