Camtasia Studio may cause audio lag when rendering videos if the required codecs are not installed on the target machine.

When Rendering out a video in Camtasia Studio without having all codecs and software installed, you may notice a lag in audio after rendering the finished product.

When rendering a video with Camtasia Studio without the required codecs installed, the audio can lag after rendering is complete.

Install QuickTime.
We noticed a 1-second audio delay when rendering out without having QuickTime installed in our test environment.
After installing QuickTime, all videos rendered with proper audio-to-video synchronization.