Resolved -
At 10:10AM EDT today, a release of Knak was published which caused issues with custom column sizing. As soon as Knak was made aware of the issue, we rolled back the release (at 11:20AM EDT). Any email, landing page, theme, or module opened during that time (10:10AM-11:20AM EDT) that had custom column sizing would have been affected.
For emails and landing pages opened during that time that have issues with column sizing, the recommendation is to use the version history feature in the info tab (https://help.knak.io/en/articles/4449817-email-landing-page-version-updates) to roll the asset back to a version prior to 10:10AM EDT this morning.
For themes and modules that are affected, please communicate with support so that they can roll those versions back in your instance.
Sep 4, 10:00 EDT