Hi,
there are two bugs:
1. one bug in krpano - when using the alphachannel=TB/SBS setting with videos, krpano wrong sends an invalid value to WebGL until the video is loaded and ready...
2. and one bug in Chrome - even when the value is invalid, WebGL should silently ignore that invalid value and continue working. That means here the new Chrome release is buggy.
There is already a Chrome Bugreport about this: https://issues.chromium.org/issues/361823993
and it seems that bug was already fixed and there should be soon a new and fixed Chrome release.
The next krpano releases will have this also fixed.
As manual workaround it would be possible to replace this:
alphachannel="TB"
with:
onvideoready.addevent="alphachannel='TB';sourceheight/=2;"
This delays the alphachannel setting until the video is ready and so bypasses this bug.
Best regards,
Klaus