Some people were affected by a bug that caused Chroma Lab to use up all of their computers memory (RAM) causing it to crash or run really slowly.
It was most likely caused by a recent SteamVR update breaking my adaptive resolution/quality implementation in Chroma Lab.
I have updated Chroma Lab to disable adaptive resolution which appears to have fixed the issue.
The down side is there may be a small loss in image quality/sharpness and you may occasionally have more dropped frames. The differences should be very small and likely not noticable.
I have also re-enabled the interactive walls during gameplay as I had accidentally disabled them during the previous update.