If a K2 smartform web part exists on the main SharePoint page, reactivating the K2 App on the Site Collection causes the web part to revert to the Form which requires you to choose which SmartForm the web part should display instead of retaining the SmartForm that was originally chosen.
When a Site Collection gets reactivated, a force activate takes place that calls for a clean feature in the K2 Database. The clean-up reinserts the referencing key values after cleaning them up for the Site collection and K2 App, but does not reinsert the referencing key value for the web part after removing it.
- Ensure you have K2 4.7 installed.
- Install the K2 4.7 February 2017 Cumulative Update.
- Get the K2 4.7 February 2017 Cumulative Update FP6 from Regional Support.
- Install the K2 4.7 February 2017 Cumulative Update FP6 to apply the fix.
- Clear the Browser cache.